Template:Primary source

This wall painting found in the Roman city of Pompeii is an example of a primary source about people in Pompeii in Roman times.

Primary source is a term used in a number of disciplines to describe source material that is closest to the person, information, period, or idea being studied.

In the study of history as an academic discipline, a primary source (also called original source or evidence) is an artifact, a document, a recording, or other source of information that was created at the time under study. It serves as an original source of information about the topic. Similar definitions are used in library science, and other areas of scholarship. In journalism, a primary source can be a person with direct knowledge of a situation, or a document created by such a person.

Primary sources are distinguished from secondary sources, which cite, comment on, or build upon primary sources, though the distinction is not a sharp one. A secondary source may also be a primary source and may depend on how it is used. "Primary" and "secondary" are relative terms, with sources judged primary or secondary according to specific historical contexts and what is being studied.Template:Rp

The significance of source classification

History and historiography

From a letter of Philip II, King of Spain, 16th century

The delineation of sources as primary and secondary first arose in the field of historiography, as historians attempted to identify and classify the sources of historical writing.Template:Citation needed In scholarly writing, an important objective of classifying sources is to determine the independence and reliability of sources. In contexts such as historical writing, it is almost always advisable to use primary sources if possible, and that "if none are available, it is only with great caution that [the author] may proceed to make use of secondary sources." Many historians believe that primary sources have the most objective connection to the past, and that they "speak for themselves" in ways that cannot be captured through the filter of secondary sources.

Many scholars have commented on the difficulty in producing secondary source narratives from the "raw data" which makes up the past. Historian/philosopher Hayden White has written extensively on the ways in which the rhetorical strategies by which historians construct narratives about the past, and what sorts of assumptions about time, history, and events are embedded in the very structure of the historical narrative. In any case, the question of the exact relation between "historical facts" and the content of "written history" has been a topic of discussion among historians since at least the 19th century, when much of the modern profession of history came into being.Template:Citation needed

As a general rule, modern historians prefer to go back to primary sources, if available, as well as seeking new ones, because primary sources, whether accurate or not, offer new input into historical questions, and most modern history revolves around heavy use of archives for the purpose of finding useful primary sources. On the other hand, most undergraduate research projects are limited to secondary source material.Template:Citation needed

Other fields

In scholarly writing, the objective of classifying sources is to determine the independence and reliability of sources. Though the terms primary source and secondary source originated in historiographyTemplate:Citation needed as a way to trace the history of historical ideas, it has been applied to many other fields. For example, this idea may be used to trace the history of scientific theories, literary elements, and other information that is passes from one author to another.

In scientific literature, a primary source is the original publication of a scientist's new data, results, and theories. In political history, primary sources reflect documents such as official reports, speeches, pamphlets, posters, or letters by participants, official election returns, and eyewitness accounts. In the history of ideas or intellectual history, the main primary sources are books, essays and letters written by intellectuals.

A study of cultural history could include fictional sources such as novels or plays. In a broader sense primary sources also include physical objects like photographs, newsreels, coins, paintings or buildings created at the time. Historians may also take archaeological artifacts and oral reports and interviews into consideration. Written sources may be divided into three main types.

• Narrative sources or literary sources tell a story or message. They are not limited to fictional sources (which can be sources of information for contemporary attitudes), but include diaries, films, biographies, leading philosophical works, scientific works, and so on.
• Diplomatic sources include charters and other legal documents which usually follow a set format.
• Social documents are records created by organizations, such as registers of births, tax records, and so on.

In the study of historiography, when the study of history is itself subject to historical scrutiny, a secondary source becomes a primary source. For a biography of a historian, that historian's publications would be primary sources. Documentary films can be considered a secondary source or primary source, depending on how much the filmmaker modifies the original sources.

The Lafayette College Library, for example, provides the following synopsis of primary sources in several basic areas of study:

"The definition of a primary source varies depending upon the academic discipline and the context in which it is used.

• In the humanities, a primary source could be defined as something that was created either during the time period being studied or afterward by individuals reflecting on their involvement in the events of that time.
• In the social sciences, the definition of a primary source would be expanded to include numerical data that has been gathered to analyze relationships between people, events, and their environment.
• In the natural sciences, a primary source could be defined as a report of original findings or ideas. These sources often appear in the form of research articles with sections on methods and results."

Finding primary sources

Although many documents that are primary sources remain in private hands, the usual location for them is an archive. These can be public or private. Documents relating to one area are usually spread over a large number of different archives. These can be distant from the original source of the document. For example, the Huntington Library in California houses a large number of documents from the United Kingdom.

In the US, digital primary sources can be retrieved from a number of places. The Library of Congress maintains several online Digital Collections where they can be retrieved. Examples of these are American Memory and the Prints and Photographs Online Catalog (PPOC). The National Archives and Records Administration also has such a tool, called Access to Archival Databases (AAD).

In the UK, the National Archives provides a consolidated search of its own catalogue and a wide variety of other archives listed on the Access to Archives index. Digital copies of various classes of documents at the National Archives (including wills) are available from DocumentsOnline. Most of the available documents relate to England and Wales. Some digital copies of primary sources are available from the National Archives of Scotland. Many County Record Offices collections are included in Access to Archives, while others have their own on-line catalogues. Many County Record Offices will supply digital copies of documents.

In the Republic of Ireland, available digital documents include the censuses of 1901 and 1911 which are available from the National Archives of Ireland.

In Australia, the National Archives of Australia has digitised a number of classes of records and will produce digitised copies of suitable documents on demand.

Using primary sources

History as an academic discipline is based on primary sources, as evaluated by the community of scholars, who report their findings in books, articles and papers. Arthur Marwick says "Primary sources are absolutely fundamental to history." Ideally, a historian will use all available primary sources created by the people involved, at the time being studied. In practice some sources have been destroyed, while others are not available for research. Perhaps the only eyewitness reports of an event may be memoirs, autobiographies, or oral interviews taken years later. Sometimes the only documents relating to an event or person in the distant past were written decades or centuries later. This is a common problem in classical studies, where sometimes only a summary of a book has survived. Potential difficulties with primary sources have the result that history is usually taught in schools using secondary sources.

Historians studying the modern period with the intention of publishing an academic article prefer to go back to available primary sources and to seek new (in other words, forgotten or lost) ones. Primary sources, whether accurate or not, offer new input into historical questions and most modern history revolves around heavy use of archives and special collections for the purpose of finding useful primary sources. A work on history is not likely to be taken seriously as scholarship if it only cites secondary sources, as it does not indicate that original research has been done.

However, primary sources - particularly those from before the 20th century - may have hidden challenges. "Primary sources, in fact, are usually fragmentary, ambiguous and very difficult to analyse and interpret." Obsolete meanings of familiar words and social context are among the traps that await the newcomer to historical studies. For this reason, the interpretation of primary texts is typically taught as part of an advanced college or postgraduate history course, however advanced self-study or informal training is also possible.

The following questions are asked about primary sources:

• What is the tone?
• Who is the intended audience?
• What is the purpose of the publication?
• What assumptions does the author make?
• What are the bases of the author's conclusions?
• Does the author agree or disagree with other authors of the subject?
• Does the content agree with what you know or have learned about the issue?
• Where was the source made? (questions of systemic bias)

In journalism, education, and other fields, these are sometimes known as the five Ws - who, what, when, where and why

Strengths and weaknesses of primary sources

In many fields and contexts, such as historical writing, it is almost always advisable to use primary sources if possible, and that "if none are available, it is only with great caution that [the author] may proceed to make use of secondary sources." In addition, primary sources avoid the problem inherent in secondary sources, where each new author may distort and put their own spin on the findings of prior cited authors. Investigative journalism, for example, is a primary source of information. However, a primary source is not necessarily more of an authority or better than a secondary source. There can be bias and other tactic used to twist historical information. Template:Quote These errors may be corrected in secondary sources, which are often subjected to peer review, can be well documented, and are often written by historians working in institutions where methodological accuracy is important to the future of the author's career and reputation. Historians consider the accuracy and objectiveness of the primary sources they are using and historians subject both primary and secondary sources to a high level of scrutiny. A primary source such as a journal entry (or the online version, a blog), at best, may only reflect one individual's opinion on events, which may or may not be truthful, accurate, or complete. Participants and eyewitnesses may misunderstand events or distort their reports (deliberately or unconsciously) to enhance their own image or importance. Such effects can increase over time, as people create a narrative that may not be accurate. For any source, primary or secondary, it is important for the researcher to evaluate the amount and direction of bias. As an example, a government report may be an accurate and unbiased description of events, but it can be censored or altered for propaganda or cover-up purposes. The facts can be distorted to present the opposing sides in a negative light. Barristers are taught that evidence in a court case may be truthful, but it may be distorted to support (or oppose) the position of one of the parties.

Classifying sources

Many sources can be considered either primary and secondary, depending on the context in which they are examined. Moreover, the distinction between primary and secondary sources is subjective and contextual, so that precise definitions are difficult to make.

If a historical text discusses old documents to derive a new historical conclusion, it is considered to be a primary source for the new conclusion. Examples in which a source can be both primary and secondary include an obituary or a survey of several volumes of a journal counting the frequency of articles on a certain topic.

Whether a source is regarded as primary or secondary in a given context may change, depending upon the present state of knowledge within the field. For example, if a document refers to the contents of a previous but undiscovered letter, that document may be considered "primary", since it is the closest known thing to an original source; but if the letter is later found, it may then be considered "secondary"

In some instances, the reason for identifying a text as the "primary source" may devolve from the fact that no copy of the original source material exists, or that it is the oldest extant source for the information cited. Alternatively, when a printed version of a document is made from an electronic version, the electronic version may be termed the primary document.

Whether a source is primary also depends on its age. For example, encyclopedias are generally considered tertiary sources, but Pliny's Naturalis Historia, originally published in the 1st century, is a primary source for information about the Roman era.

Forgeries

Historians must occasionally contend with forged documents, purporting to be primary sources. These forgeries have usually been constructed with a fraudulent purpose, such as promulgating legal rights, supporting false pedigrees, or promoting particular interpretations of historic events. The investigation of documents to determine their authenticity is diplomatics.

For centuries, Popes used the forged Donation of Constantine to bolster the secular power of the Papacy. Among the earliest forgeries are false Anglo-Saxon Charters, a number of 11th and 12th century forgeries produced by monasteries and abbeys to support a claim to land where the original document had been lost or never existed. One particularly unusual forgery of a primary source was perpetrated by Sir Edward Dering, who placed false monumental brasses in a parish church. In 1986, Hugh Trevor-Roper "authenticated" the Hitler diaries, which were later proved to be forgeries. Recently, forged documents have been placed within the UK National Archives in the hope of establishing a false provenance. However, historians dealing with recent centuries rarely encounter forgeries of any importance.Template:Rp

See also

• Historiography
• Source criticism
• Source literature
• Source text
• Historical document
• Historical editorial
• Secondary source
• Tertiary source
• Original research
• UNISIST model
• Scientific journalism

References

• Template:About

Broadly, a citation is a reference to a published or unpublished source (not always the original source). More precisely, a citation is an abbreviated alphanumeric expression (e.g. [Newell84]) embedded in the body of an intellectual work that denotes an entry in the bibliographic references section of the work for the purpose of acknowledging the relevance of the works of others to the topic of discussion at the spot where the citation appears. Generally the combination of both the in-body citation and the bibliographic entry constitutes what is commonly thought of as a citation (whereas bibliographic entries by themselves are not).

A prime purpose of a citation is intellectual honesty; to attribute to other authors the ideas they have previously expressed, rather than give the appearance to the work's readers that the work's authors are the original wellsprings of those ideas.

The forms of citations generally subscribe to one of the generally-accepted citations systems, such as the Harvard, APA, and other citations systems, as their syntactic conventions are widely-known and easily interpreted by readers. Each of these citation systems has its respective advantages and disadvantages relative to the tradeoffs of being informative (but not too disruptive) and thus should be chosen relative to the needs of the type of publication being crafted. Editors will often specify the citation system to use.

Bibliographies, and other list-like compilations of references, are generally not considered citations because they do not fulfill the true spirit of the term: deliberate acknowledgement by other authors of the priority of one's ideas.

Concepts

• A bibliographic citation is a reference to a book, article, web page, or other published item. Citations should supply sufficient detail to identify the item uniquely. Different citation systems and styles are used in scientific citation, legal citation, prior art, and the arts and the humanities.
• A citation number, used in some citation systems, is a number or symbol added inline and usually in superscript, to refer readers to a footnote or endnote that cites the source. In other citation systems, an inline parenthetical reference is used rather than a citation number, with limited information such as the author's last name, year of publication, and page number referenced; a full identification of the source will then appear in an appended bibliography.

Citation content

Citation content can vary depending on the type of source and may include:

• Book: author(s), book title, publisher, date of publication, and page number(s) if appropriate.
• Journal: author(s), article title, journal title, date of publication, and page number(s).
• Newspaper: author(s), article title, name of newspaper, section title and page number(s) if desired, date of publication.
• Web site: author(s), article and publication title where appropriate, as well as a URL, and a date when the site was accessed.
• Play: inline citations offer part, scene, and line numbers, the latter separated by periods: 4.452 refers to scene 4, line 452. For example, "In Eugene Onegin, Onegin rejects Tanya when she is free to be his, and only decides he wants her when she is already married" (Pushkin 4.452-53).
• Poem: spaced slashes are normally used to indicate separate lines of a poem, and parenthetical citations usually include the line number(s). For example: "For I must love because I live / And life in me is what you give." (Brennan, lines 15–16).

Unique identifiers

Along with information such as author(s), date of publication, title and page numbers, citations may also include unique identifiers depending on the type of work being referred to.

• Citations of books may include an International Standard Book Number (ISBN).
• Specific volumes, articles or other identifiable parts of a periodical, may have an associated Serial Item and Contribution Identifier (SICI).
• Electronic documents may have a digital object identifier (DOI).
• Biomedical research articles may have a PubMed Identifier (PMID).

Citation systems

Broadly speaking, there are two citation systems:

Note systems

Note systems involve the use of sequential numbers in the text which refer to either footnotes (notes at the end of the page) or endnotes (a note on a separate page at the end of the paper) which gives the source detail. The notes system may or may not require a full bibliography, depending on whether the writer has used a full note form or a shortened note form.

For example, an excerpt from the text of a paper using a notes system without a full bibliography could look like this:

"The five stages of grief are denial, anger, bargaining, depression, and acceptance."¹

The note, located either at the foot of the page (footnote) or at the end of the paper (endnote) would look like this:

1. Elisabeth Kübler-Ross, On Death and Dying (New York: Macmillan, 1969) 45–60.

In a paper which contains a full bibliography, the shortened note could look like this:

1. Kübler-Ross, On Death and Dying 45–60.

and the bibliography entry, which would be required with a shortened note, would look like this:

Kübler-Ross, Elisabeth. On Death and Dying. New York: Macmillan, 1969.

In the humanities, many authors use footnotes or endnotes to supply anecdotal information. In this way, what looks like a citation is actually supplementary material, or suggestions for further reading.

Parenthetical referencing

Parenthetical referencing is where full or partial, in-text citations are enclosed within parentheses and embedded in the paragraph, as opposed to the footnote style. Depending on the choice of style, fully cited parenthetical references may require no end section. Alternately a list of the citations with complete bibliographical references may be included in an end section sorted alphabetically by author's last name.

This section may be known as:

• References
• Bibliography
• Works cited
• Works consulted

Citation styles

Citation styles can be broadly divided into styles common to the Humanities and the Sciences, though there is considerable overlap. Some style guides, such as the Chicago Manual of Style, are quite flexible and cover both parenthetical and note citation systems. Others, such as MLA and APA styles, specify formats within the context of a single citation system. These may be referred to as citation formats as well as citation styles. The various guides thus specify order of appearance, for example, of publication date, title, and page numbers following the author name, in addition to conventions of punctuation, use of italics, emphasis, parenthesis, quotation marks, etc., particular to their style.

A number of organizations have created styles to fit their needs; consequently, a number of different guides exist. Individual publishers often have their own in-house variations as well, and some works are so long-established as to have their own citation methods too: Stephanus pagination for Plato; Bekker numbers for Aristotle; citing the Bible by book, chapter and verse; or Shakespeare notation by play, act and scene.

Some examples of style guides include:

Humanities

• The American Political Science Association (APSA) relies on the Style Manual for Political Science, a style often used by political science scholars and historians. It is largely based on that of the Chicago Manual of Style.
• The ASA style of American Sociological Association is one of the main styles used in sociological publications.
• The Chicago Style (CMOS) was developed and its guide is The Chicago Manual of Style. Some social sciences and humanities scholars use the nearly identical Turabian style. Used by writers in many fields.
• The Columbia Style was made by Janice R. Walker and Todd Taylor to give detailed guidelines for citing internet sources. Columbia Style offers models for both the humanities and the sciences.
• Evidence Explained: Citing History Sources from Artifacts to Cyberspace by Elizabeth Shown Mills covers primary sources not included in CMOS, such as censuses, court, land, government, business, and church records. Includes sources in electronic format. Used by genealogists and historians.
• Harvard referencing (or author-date system) is a specific kind of parenthetical referencing. Parenthetical referencing is recommended by both the British Standards Institution and the Modern Language Association. Harvard referencing involves a short author-date reference, e.g., "(Smith, 2000)", being inserted after the cited text within parentheses and the full reference to the source being listed at the end of the article.
• MLA style was developed by the Modern Language Association and is most often used in the arts and the humanities, particularly in English studies, other literary studies, including comparative literature and literary criticism in languages other than English ("foreign languages"), and some interdisciplinary studies, such as cultural studies, drama and theatre, film, and other media, including television. This style of citations and bibliographical format uses parenthetical referencing with author-page (Smith 395) or author-[short] title-page (Smith, Contingencies 42) in the case of more than one work by the same author within parentheses in the text, keyed to an alphabetical list of sources on a "Works Cited" page at the end of the paper, as well as notes (footnotes or endnotes). See The MLA Style Manual and The MLA Handbook for Writers of Research Papers, particularly Citation and bibliography format.
• The MHRA Style Guide is published by the Modern Humanities Research Association (MHRA) and most widely used in the arts and humanities in the United Kingdom, where the MHRA is based. It is available for sale both in the UK and in the United States. It is similar to MLA style, but has some differences. For example, MHRA style uses footnotes that reference a citation fully while also providing a bibliography. Some readers find it advantageous that the footnotes provide full citations, instead of shortened references, so that they do not need to consult the bibliography while reading for the rest of the publication details.

Law

• The Bluebook is a citation system traditionally used in American academic legal writing, and the Bluebook (or similar systems derived from it) are used by many courts. At present, academic legal articles are always footnoted, but motions submitted to courts and court opinions traditionally use inline citations which are either separate sentences or separate clauses.
• The legal citation style used almost universally in Canada is based on the Canadian Guide to Uniform Legal Citation (aka McGill Guide), published by McGill Law Journal.

Sciences, mathematics, engineering, physiology, and medicine

• The American Chemical Society style, or ACS style, is often used in chemistry and other physical sciences. In ACS style references are numbered in the text and in the reference list, and numbers are repeated throughout the text as needed.
• In the style of the American Institute of Physics (AIP style), references are also numbered in the text and in the reference list, with numbers repeated throughout the text as needed.
• Styles developed for the American Mathematical Society (AMS), or AMS styles, such as AMS-LaTeX, are typically implemented using the BibTeX tool in the LaTeX typesetting environment. Brackets with author’s initials and year are inserted in the text and at the beginning of the reference. Typical citations are listed in-line with alphabetic-label format, e.g. [AB90]. This type of style is also called a "Authorship trigraph."
• The Vancouver system, recommended by the Council of Science Editors (CSE), is used in medical and scientific papers and research.
  • In one major variant, that used by the American Society of Mechanical Engineers (ASME), citation numbers are included in the text in square brackets rather than as superscripts. All bibliographical information is exclusively included in the list of references at the end of the document, next to the respective citation number.
  • The International Committee of Medical Journal Editors (ICMJE) is reportedly the original kernel of this biomedical style which evolved from the Vancouver 1978 editors' meeting. The MEDLINE/PubMed database uses this citation style and the National Library of Medicine provides "ICMJE Uniform Requirements for Manuscripts Submitted to Biomedical Journals -- Sample References".
• The style of the Institute of Electrical and Electronics Engineers (IEEE), or IEEE style, encloses citation numbers within square brackets and arranges the reference list by the order of citation, not by alphabetical order.
• Pechenik Citation Style is a style described in A Short Guide to Writing about Biology, 6th ed. (2007), by Jan A. Pechenik.
• In 2006, Eugene Garfield proposed a bibliographic system for scientific literature, to consolidate the integrity of scientific publications.

Social sciences

• The style of the American Psychological Association, or APA style, published in The Style Manual of the APA, is most often used in social sciences. APA style uses Harvard referencing within the text, listing the author's name and year of publication, keyed to an alphabetical list of sources at the end of the paper on a References page
• The American Political Science Association publishes both a style manual and a style guide for publications in this field.
• The American Anthropological Association utilizes a modified form of the Chicago Style laid out in their Publishing Style Guide

See also

• Acknowledgment (creative arts)
• Bible citation
• Case citation
• Citation creator
• Citation signal
• Citationality
• Credit (creative arts)
• Cross-reference
• Scholarly method
• Source evaluation
• Style guide

Footnotes

References

• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web (2nd ed.)
• Template:Cite book
• Template:Cite web

External links

Guidelines

• Citing Government Documents/Government Agency Style Manuals, University of North Texas Libraries.
• Document it Citation and Referee AMS, and the AMSRefs package.
• Guide to Citation Style Guides
• ONLINE! Citation Styles (An online guide to different citation formats)
• "What is citation?", Turnitin.com

Examples

• Illustrated examples, generated using BibTeX, of several major styles, including more than those listed above.
• PDF file bibstyles.pdf illustrates how several bibliographic styles appear with citations and reference entries, generated using BibTeX.

Style guides

• AMA Citation Style
• How to write footnotes, endnotes and electronic references in a proper format
• Swarthmore library's Guide to Citation Styles for Science and Humanities.

Other online resources

• thehistorysite.org Online resources for historical research and writing.

• Template:About

Broadly, a citation is a reference to a published or unpublished source (not always the original source). More precisely, a citation is an abbreviated alphanumeric expression (e.g. [Newell84]) embedded in the body of an intellectual work that denotes an entry in the bibliographic references section of the work for the purpose of acknowledging the relevance of the works of others to the topic of discussion at the spot where the citation appears. Generally the combination of both the in-body citation and the bibliographic entry constitutes what is commonly thought of as a citation (whereas bibliographic entries by themselves are not).

A prime purpose of a citation is intellectual honesty; to attribute to other authors the ideas they have previously expressed, rather than give the appearance to the work's readers that the work's authors are the original wellsprings of those ideas.

The forms of citations generally subscribe to one of the generally-accepted citations systems, such as the Harvard, APA, and other citations systems, as their syntactic conventions are widely-known and easily interpreted by readers. Each of these citation systems has its respective advantages and disadvantages relative to the tradeoffs of being informative (but not too disruptive) and thus should be chosen relative to the needs of the type of publication being crafted. Editors will often specify the citation system to use.

Bibliographies, and other list-like compilations of references, are generally not considered citations because they do not fulfill the true spirit of the term: deliberate acknowledgement by other authors of the priority of one's ideas.

Concepts

• A bibliographic citation is a reference to a book, article, web page, or other published item. Citations should supply sufficient detail to identify the item uniquely. Different citation systems and styles are used in scientific citation, legal citation, prior art, and the arts and the humanities.
• A citation number, used in some citation systems, is a number or symbol added inline and usually in superscript, to refer readers to a footnote or endnote that cites the source. In other citation systems, an inline parenthetical reference is used rather than a citation number, with limited information such as the author's last name, year of publication, and page number referenced; a full identification of the source will then appear in an appended bibliography.

Citation content

Citation content can vary depending on the type of source and may include:

• Book: author(s), book title, publisher, date of publication, and page number(s) if appropriate.
• Journal: author(s), article title, journal title, date of publication, and page number(s).
• Newspaper: author(s), article title, name of newspaper, section title and page number(s) if desired, date of publication.
• Web site: author(s), article and publication title where appropriate, as well as a URL, and a date when the site was accessed.
• Play: inline citations offer part, scene, and line numbers, the latter separated by periods: 4.452 refers to scene 4, line 452. For example, "In Eugene Onegin, Onegin rejects Tanya when she is free to be his, and only decides he wants her when she is already married" (Pushkin 4.452-53).
• Poem: spaced slashes are normally used to indicate separate lines of a poem, and parenthetical citations usually include the line number(s). For example: "For I must love because I live / And life in me is what you give." (Brennan, lines 15–16).

Unique identifiers

Along with information such as author(s), date of publication, title and page numbers, citations may also include unique identifiers depending on the type of work being referred to.

• Citations of books may include an International Standard Book Number (ISBN).
• Specific volumes, articles or other identifiable parts of a periodical, may have an associated Serial Item and Contribution Identifier (SICI).
• Electronic documents may have a digital object identifier (DOI).
• Biomedical research articles may have a PubMed Identifier (PMID).

Citation systems

Broadly speaking, there are two citation systems:

Note systems

Note systems involve the use of sequential numbers in the text which refer to either footnotes (notes at the end of the page) or endnotes (a note on a separate page at the end of the paper) which gives the source detail. The notes system may or may not require a full bibliography, depending on whether the writer has used a full note form or a shortened note form.

For example, an excerpt from the text of a paper using a notes system without a full bibliography could look like this:

"The five stages of grief are denial, anger, bargaining, depression, and acceptance."¹

The note, located either at the foot of the page (footnote) or at the end of the paper (endnote) would look like this:

1. Elisabeth Kübler-Ross, On Death and Dying (New York: Macmillan, 1969) 45–60.

In a paper which contains a full bibliography, the shortened note could look like this:

1. Kübler-Ross, On Death and Dying 45–60.

and the bibliography entry, which would be required with a shortened note, would look like this:

Kübler-Ross, Elisabeth. On Death and Dying. New York: Macmillan, 1969.

In the humanities, many authors use footnotes or endnotes to supply anecdotal information. In this way, what looks like a citation is actually supplementary material, or suggestions for further reading.

Parenthetical referencing

Parenthetical referencing is where full or partial, in-text citations are enclosed within parentheses and embedded in the paragraph, as opposed to the footnote style. Depending on the choice of style, fully cited parenthetical references may require no end section. Alternately a list of the citations with complete bibliographical references may be included in an end section sorted alphabetically by author's last name.

This section may be known as:

• References
• Bibliography
• Works cited
• Works consulted

Citation styles

Citation styles can be broadly divided into styles common to the Humanities and the Sciences, though there is considerable overlap. Some style guides, such as the Chicago Manual of Style, are quite flexible and cover both parenthetical and note citation systems. Others, such as MLA and APA styles, specify formats within the context of a single citation system. These may be referred to as citation formats as well as citation styles. The various guides thus specify order of appearance, for example, of publication date, title, and page numbers following the author name, in addition to conventions of punctuation, use of italics, emphasis, parenthesis, quotation marks, etc., particular to their style.

A number of organizations have created styles to fit their needs; consequently, a number of different guides exist. Individual publishers often have their own in-house variations as well, and some works are so long-established as to have their own citation methods too: Stephanus pagination for Plato; Bekker numbers for Aristotle; citing the Bible by book, chapter and verse; or Shakespeare notation by play, act and scene.

Some examples of style guides include:

Humanities

• The American Political Science Association (APSA) relies on the Style Manual for Political Science, a style often used by political science scholars and historians. It is largely based on that of the Chicago Manual of Style.
• The ASA style of American Sociological Association is one of the main styles used in sociological publications.
• The Chicago Style (CMOS) was developed and its guide is The Chicago Manual of Style. Some social sciences and humanities scholars use the nearly identical Turabian style. Used by writers in many fields.
• The Columbia Style was made by Janice R. Walker and Todd Taylor to give detailed guidelines for citing internet sources. Columbia Style offers models for both the humanities and the sciences.
• Evidence Explained: Citing History Sources from Artifacts to Cyberspace by Elizabeth Shown Mills covers primary sources not included in CMOS, such as censuses, court, land, government, business, and church records. Includes sources in electronic format. Used by genealogists and historians.
• Harvard referencing (or author-date system) is a specific kind of parenthetical referencing. Parenthetical referencing is recommended by both the British Standards Institution and the Modern Language Association. Harvard referencing involves a short author-date reference, e.g., "(Smith, 2000)", being inserted after the cited text within parentheses and the full reference to the source being listed at the end of the article.
• MLA style was developed by the Modern Language Association and is most often used in the arts and the humanities, particularly in English studies, other literary studies, including comparative literature and literary criticism in languages other than English ("foreign languages"), and some interdisciplinary studies, such as cultural studies, drama and theatre, film, and other media, including television. This style of citations and bibliographical format uses parenthetical referencing with author-page (Smith 395) or author-[short] title-page (Smith, Contingencies 42) in the case of more than one work by the same author within parentheses in the text, keyed to an alphabetical list of sources on a "Works Cited" page at the end of the paper, as well as notes (footnotes or endnotes). See The MLA Style Manual and The MLA Handbook for Writers of Research Papers, particularly Citation and bibliography format.
• The MHRA Style Guide is published by the Modern Humanities Research Association (MHRA) and most widely used in the arts and humanities in the United Kingdom, where the MHRA is based. It is available for sale both in the UK and in the United States. It is similar to MLA style, but has some differences. For example, MHRA style uses footnotes that reference a citation fully while also providing a bibliography. Some readers find it advantageous that the footnotes provide full citations, instead of shortened references, so that they do not need to consult the bibliography while reading for the rest of the publication details.

Law

• The Bluebook is a citation system traditionally used in American academic legal writing, and the Bluebook (or similar systems derived from it) are used by many courts. At present, academic legal articles are always footnoted, but motions submitted to courts and court opinions traditionally use inline citations which are either separate sentences or separate clauses.
• The legal citation style used almost universally in Canada is based on the Canadian Guide to Uniform Legal Citation (aka McGill Guide), published by McGill Law Journal.

Sciences, mathematics, engineering, physiology, and medicine

• The American Chemical Society style, or ACS style, is often used in chemistry and other physical sciences. In ACS style references are numbered in the text and in the reference list, and numbers are repeated throughout the text as needed.
• In the style of the American Institute of Physics (AIP style), references are also numbered in the text and in the reference list, with numbers repeated throughout the text as needed.
• Styles developed for the American Mathematical Society (AMS), or AMS styles, such as AMS-LaTeX, are typically implemented using the BibTeX tool in the LaTeX typesetting environment. Brackets with author’s initials and year are inserted in the text and at the beginning of the reference. Typical citations are listed in-line with alphabetic-label format, e.g. [AB90]. This type of style is also called a "Authorship trigraph."
• The Vancouver system, recommended by the Council of Science Editors (CSE), is used in medical and scientific papers and research.
  • In one major variant, that used by the American Society of Mechanical Engineers (ASME), citation numbers are included in the text in square brackets rather than as superscripts. All bibliographical information is exclusively included in the list of references at the end of the document, next to the respective citation number.
  • The International Committee of Medical Journal Editors (ICMJE) is reportedly the original kernel of this biomedical style which evolved from the Vancouver 1978 editors' meeting. The MEDLINE/PubMed database uses this citation style and the National Library of Medicine provides "ICMJE Uniform Requirements for Manuscripts Submitted to Biomedical Journals -- Sample References".
• The style of the Institute of Electrical and Electronics Engineers (IEEE), or IEEE style, encloses citation numbers within square brackets and arranges the reference list by the order of citation, not by alphabetical order.
• Pechenik Citation Style is a style described in A Short Guide to Writing about Biology, 6th ed. (2007), by Jan A. Pechenik.
• In 2006, Eugene Garfield proposed a bibliographic system for scientific literature, to consolidate the integrity of scientific publications.

Social sciences

• The style of the American Psychological Association, or APA style, published in The Style Manual of the APA, is most often used in social sciences. APA style uses Harvard referencing within the text, listing the author's name and year of publication, keyed to an alphabetical list of sources at the end of the paper on a References page
• The American Political Science Association publishes both a style manual and a style guide for publications in this field.
• The American Anthropological Association utilizes a modified form of the Chicago Style laid out in their Publishing Style Guide

See also

• Acknowledgment (creative arts)
• Bible citation
• Case citation
• Citation creator
• Citation signal
• Citationality
• Credit (creative arts)
• Cross-reference
• Scholarly method
• Source evaluation
• Style guide

Footnotes

References

• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web
• Template:Cite web (2nd ed.)
• Template:Cite book
• Template:Cite web

External links

Guidelines

• Citing Government Documents/Government Agency Style Manuals, University of North Texas Libraries.
• Document it Citation and Referee AMS, and the AMSRefs package.
• Guide to Citation Style Guides
• ONLINE! Citation Styles (An online guide to different citation formats)
• "What is citation?", Turnitin.com

Examples

• Illustrated examples, generated using BibTeX, of several major styles, including more than those listed above.
• PDF file bibstyles.pdf illustrates how several bibliographic styles appear with citations and reference entries, generated using BibTeX.

Style guides

• AMA Citation Style
• How to write footnotes, endnotes and electronic references in a proper format
• Swarthmore library's Guide to Citation Styles for Science and Humanities.

Other online resources

• thehistorysite.org Online resources for historical research and writing.

• Wood Gray, Historian's handbook, a key to the study and writing of history (Houghton Mifflin, 1964).
• Template:Cite book
• Olden-Jørgensen, Sebastian (2001). Til kilderne! Introduktion til historisk kildekritik. København: Gads Forlag. ("To the sources: Introduction to historical source criticism").

External links

Primary sources repositories

• Primary Sources from World War One and Two Database of mailed letters to and from soldiers during major world conflicts from the Napoleonic Wars to World War Two.
• Footnote - Over 60,000,000 Primary Source Documents
• A listing of over 5000 websites describing holdings of manuscripts, archives, rare books, historical photographs, and other primary sources
• Find primary sources in the collections of major research libraries using ArchiveGrid

All sources repositories

• Wikisource – The Free Library – the Wikimedia project that collects, edits, and catalogs all source texts

essays and descriptions of primary, secondary and other sources

• "Research Using Primary Sources" from the University of Maryland Libraries
• "How to distinguish between primary and secondary sources" from the University of California, Santa Cruz Library
• "Primary, Secondary, and Tertiary sources" from James Cook University Library
• Joan of Arc: Primary Sources Series -- Example of a publication focusing on primary source documents.
• Finding primary sources from the University of California, Berkeley library
• "Primary versus secondary sources" from the Bowling Green State University library
• Finding primary sources in world history
• Guide to Terminology used when describing archival and other primary source materials.
• thehistorysite.org Links to many online history archival sources.