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{{About|the research concept acknowledging the use of another's ideas}}
{{Selfref|"Citation needed" redirects here. For the Wikipedia tag, see [[Template:Citation needed]]. For Wikipedia's citation guideline, see [[Wikipedia:Citing sources]]. For Wikipedia's citation templates, see [[Wikipedia:Citation templates]].}}

Broadly, a '''citation''' is a [[reference]] to a published or unpublished source (not always the original source).<ref>[http://www.kyvl.org/html/tutorial/research/intext.shtml Citing indirect sources]</ref> 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 (publishing)|article]], [[web page]], or other published item. Citations should supply sufficient detail to identify the item uniquely.<ref>{{cite web |url=http://www.ben.edu/library/help/glossary.htm |title=Library glossary |accessdate=2009-02-27 |date=August 22, 2008 |work= |publisher=[[Benedictine University]] |dateformat=lmdy}}</ref> 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.<ref>[[Long Island University]].</ref><ref>[[Duke University]] Libraries 2007.</ref>
*''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 [[Uniform Resource Locator|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).<ref name=Brigham>[[Brigham Young University]] 2008.</ref>
*''Poem:'' spaced [[Slash (punctuation)#In English text|slashes]] are normally used to indicate separate lines of a poem, and [[Parenthetical referencing|parenthetical citations]] usually include the line number(s). For example: "For I must love because I live&nbsp;/ And life in me is what you give." (Brennan, lines 15&ndash;16).<ref name=Brigham/>

=== Unique identifiers ===
Along with [[information]] such as author(s), date of [[publication]], [[title]] and [[page number]]s, 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:<ref>[[University of Maryland, College Park]] 2006.</ref><ref name=YaleUni>[[Yale University]] 2008.</ref><ref name=ColoradoStateUni>[[Colorado State University]] 2008.</ref>

=== 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."<sup>1</sup>

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.<ref>{{cite web |url=http://www.studenthandouts.com/citations.htm |title=How to Write Research Papers with Citations - MLA, APA, Footnotes, Endnotes |accessdate=2010-01-31 |dateformat=lmdy}}</ref>

===[[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 ==
{{styles}}
{{Main|APA style|MLA style|The Chicago Manual of Style|Bluebook|ALWD Citation Manual|ASA style|Harvard referencing|Vancouver system}}

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.<ref name=ColoradoStateUni/> Others, such as [[MLA style manual|MLA]] and [[APA style|APA]] styles, specify formats within the context of a single citation system.<ref name=YaleUni/> These may be referred to as citation formats as well as citation styles.<ref>[[California State University]] 2007.</ref><ref>[[Lesley University]] 2007.</ref><ref>[[Rochester Institute of Technology]] 2003.</ref> 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 [[The Chicago Manual of Style|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.<ref name="evidence">Mills, Elizabeth Shown. Evidence explained : citing history sources from artifacts to cyberspace (Baltimore:Genealogical Pub. Co., 2007).</ref>
*[[Harvard referencing]] (or author-date system) is a specific kind of [[parenthetical referencing]].  Parenthetical referencing is recommended by both the [[BSI Group|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. 
*[[The MLA Style Manual|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 criticism|literary studies]], including [[comparative literature]] and [[literary criticism]] in languages other than English ("[[foreign languages]]"), and some [[Interdisciplinarity|interdisciplinary]] studies, such as [[cultural studies]], [[drama]] and [[theatre]], [[film]], and other [[Mass media|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 [[The MLA Style Manual#Citation and bibliography format|Citation and bibliography format]].<ref>The field of [[Communication]] (or Communications) overlaps with some of the disciplines also covered by the [[Modern Language Association|MLA]] and has its own disciplinary style recommendations for documentation format; the style guide recommended for use in student papers in such departments in American colleges and universities is often ''[[APA style|The Publication Manual of the APA]]'' ([[American Psychological Association]]); designated for short as "[[APA style]]".</ref>
*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 [[The MLA Style Manual|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.<ref>The 2nd edition (updated April 2008) of the ''[[MHRA Style Guide]]'' is downloadable for free from the [[Modern Humanities Research Association]] official Website.</ref>

=== Law ===
{{Main|Legal citation}}
*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.<ref>Martin 2007.</ref> At present, academic legal articles are always footnoted, but motions submitted to courts and court opinions traditionally use [[inline citation]]s 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''.<ref>''[http://lawjournal.mcgill.ca/citeguide.php Canadian Guide to Uniform Legal Citation (Cite Guide)]''. ''McGill Law Journal''.  Updated October 2008.  Retrieved on 2009-02-05.</ref>

=== Sciences, mathematics, engineering, physiology, and medicine ===
{{Main|Scientific citation}}
*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.<ref>''[http://www.icmje.org Uniform Requirements for Manuscripts Submitted to Biomedical Journals]''.</ref>  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".<ref>International Committee of Medical Journal Editors.  [http://www.nlm.nih.gov/bsd/uniform_requirements.html "ICMJE Uniform Requirements for Manuscripts Submitted to Biomedical Journals -- Sample References"].</ref>
*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 Pechenik|Jan A. Pechenik]].<ref>''[http://www.augustana.ca/files/group/418/pechenik_qg_november2007.pdf Pechenik Citation Style QuickGuide]'' ([[PDF]]).  [[University of Alberta]], Augustana Campus, Canada.  [[World Wide Web|Web]].  November 2007.</ref>
*In 2006, Eugene Garfield proposed a bibliographic system for scientific literature, to consolidate the integrity of [[scientific publishing|scientific publications]].<ref name=cisn>{{cite journal
  | last = Garfield
  | first = Eugene
  | authorlink = 
  | coauthors = 
  | title = Citation indexes for science. A new dimension in documentation through association of ideas
  | journal = International Journal of Epidemiology
  | volume = 35
  | issue = 5
  | pages = 1123–1127
  | publisher = 
  | location = 
  | date = 2006
  | url = 
  | issn = 
  | doi = 1093/ije/dyl189
  | id = 
  | accessdate = 12 June 2009
  | pmid = 16987841
  | doi_brokendate = 2010-01-07}}</ref>

=== 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.<ref name=APSA>Stephen Yoder, ed. (2008). ''The APSA Guide to Writing and Publishing'' and ''Style Manual for Political Science''.  Rev. ed. August 2006.    
[http://www.apsanet.org/content_6899.cfm?navID=248 APSAnet.org Publications].  Retrieved on 2009-02-05.</ref>
*The [[American Anthropological Association]] utilizes a modified form of the [[Chicago Manual of Style|Chicago Style]] laid out in their [http://www.aaanet.org/publications/guidlines.cfm 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 ==
{{Reflist|2}}

== References ==
<!--This list needs to be ordered alphabetically.-->
{{Refbegin}}
*<cite id=refUCBerkeley>{{cite web |url=http://www.lib.berkeley.edu/CHEM/acsstyle.html |title=ACS (American Chemical Society) Style Guidelines Quick Guide |work=Berkeley.edu |year=2006 |accessdate=2008-02-03}}</cite>
*<cite id=refLongIslandUni>{{cite web |url=http://www.liunet.edu/cwis/cwp/library/workbook/evaluate.htm#citing |title=Anatomy of a Citation |work=LIUNet.edu |accessdate=2008-02-03}}</cite>
*<cite id=refLesleyUni>{{cite web |url=http://www.lesley.edu/library/guides/citation/apa.html |title=APA Citation Format |work=Lesley.edu |year=2005 |accessdate=2008-02-11}}</cite>
*<cite id=refRIT>{{cite web |url=http://wally.rit.edu/pubs/guides/apa.html |title=APA Citation Format |work=RIT.edu |year=2003 |accessdate=2008-02-11}}</cite>
*<cite id=refArmstrong 2007>{{cite journal |url=http://marketing.wharton.upenn.edu/ideas/pdf/armstrong2/armstrong-managementfolklore.pdf |title=The Ombudsman: Management Folklore and Management Science - On Portfolio Planning, Escalation Bias, and Such |journal=Interfaces |publisher=Institute of Management Sciences |location=[[Providence, Rhode Island|Providence]] |first=J Scott |last=Armstrong |pages=28–42 |volume=26 |issue=4 |date=July 1996 |oclc=210941768}}</cite>
*<cite id=refASME>{{cite web |url=http://journaltool.asme.org/Help/AuthorHelp/WebHelp/JournalsHelp.htm |title=ASME Journals Digital Submission Tool |work=ASME.org |publisher=American Society of Mechanical Engineers |accessdate=2008-02-08}}</cite>
*<cite id=refDukeUni>{{cite web |url=http://library.duke.edu/research/citing/workscited/booksingle.html |title=Book with a Single Author |work=Duke.edu |year=2007 |accessdate=2008-02-04}}</cite>
*<cite id=refColoradoUni>{{cite web |url=http://writing.colostate.edu/guides/researchsources/documentation/cbe_citation/index.cfm |title=CBE - Council of Biology Editors (Citation/Sequence System) |work=ColoState.edu |year=2008 |accessdate=2008-02-11}}</cite>
*<cite id=refCaliforniaStateUni>{{cite web |url=http://www.csuchico.edu/lref/newciting.html |title=Citation Formats & Style Manuals |work=CSUChico.edu |year=2007 |accessdate=2008-02-11}}</cite>
*<cite id=refUniMaryland>{{cite web |url=http://www.lib.umd.edu/guides/style_manuals.html |title=Citation Systems and Style Manuals |work=UMD.edu |year=2006 |accessdate=2008-02-11}}</cite>
*<cite id=refBrigham>{{cite web |url=http://www.byui.edu/english/mlaguide/MLA_intext_citation.htm |title=How to cite sources in the body of your paper |work=BYUI.edu |year=2008 |accessdate=2008-02-08}}</cite>
*<cite id=refIEEEstyle>{{cite web |url=http://www.ieee.org/portal/cms_docs_iportals/iportals/publications/authors/transjnl/stylemanual.pdf |title=IEEE Editorial Style Manual |work=IEEE.org |year=2007 |accessdate=2008-02-08}}</cite>
*<cite id=refMartin2007>{{cite web |url=http://www.law.cornell.edu/citation/ |title=Introduction to Basic Legal Citation (LII 2007 ed.) |work=Cornell.edu |first=Peter W |last=Martin |origyear=1993 |date=May 2007 |accessdate=2008-02-03}}</cite>
*<cite id=refMHRA>{{cite web |url=http://www.mhra.org.uk/Publications/Books/StyleGuide/ |title=MHRA Style Guide: A Handbook for Authors, Editors, and Writers of Theses|work=MHRA.org.uk |publisher=Modern Humanities Research Association|year=2008|accessdate=2009-02-05}} (2nd ed.)</cite>
*<cite id=refPechenik2004>{{cite book |title=A Short Guide to Writing About Biology |publisher=Pearson/Longman |location=[[New York City|New York]] |first=Jan A |last=Pechenik |year=2004 |edition=5th |isbn=0321159810 |oclc=52166026}}</cite>
*<cite id=refYaleUni>{{cite web |url=http://www.yale.edu/bass/writing/sources/kinds/principles/why.html |title=Why Are There Different Citation Styles? |work=Yale.edu |year=2008 |accessdate=2008-02-11}}</cite>
*<cite id=refWright & Armstrong 2008>{{cite journal |url=http://marketing.wharton.upenn.edu/Marketing_Content_Management/Marketing_files/Publication_Files/Citations-Interfaces.pdf |title=The Ombudsman: Verification of Citations: Fawlty Towers of Knowledge? |journal=Interfaces |publisher=Institute of Management Sciences |location=[[Providence, Rhode Island|Providence]] |first=Malcolm |last=Wright |coauthors=Armstrong, J Scott |pages=125–139 |volume=38 |issue=2 |date=March 2008 |oclc=229821277 |doi=10.1287/inte.1070.0317 |format={{Dead link|date=March 2009}} &ndash; <sup>[http://scholar.google.co.uk/scholar?hl=en&lr=&q=author%3AWright+intitle%3AThe+Ombudsman%3A+Verification+of+Citations%3A+Fawlty+Towers+of+Knowledge%3F&as_publication=Interface&as_ylo=&as_yhi=&btnG=Search Scholar search]</sup>}}</cite>
{{Refend}}

== External links ==
;Guidelines
*[http://www.library.unt.edu/govinfo/browse-topics/citation-guides-and-style-manuals/citing-government-documents/?searchterm=citing%20government Citing Government Documents/Government Agency Style Manuals], University of North Texas Libraries.
*[http://www.documentit.co.uk/download.php Document it Citation and Referee AMS], and the [[AMSRefs]] package.
*[http://bailiwick.lib.uiowa.edu/journalism/cite.html Guide to Citation Style Guides]
*[http://www.bedfordstmartins.com/online/citex.html ONLINE! Citation Styles (An online guide to different citation formats)]
*[http://turnitin.com/research_site/e_citation.html "What is citation?"], ''Turnitin.com''

;Examples
*[http://www.cs.stir.ac.uk/~kjt/software/latex/showbst.html Illustrated examples], generated using [[BibTeX]], of several major styles, including more than those listed above.
*PDF file [http://amath.colorado.edu/documentation/LaTeX/reference/faq/bibstyles.pdf bibstyles.pdf] illustrates how several bibliographic styles appear with citations and reference entries, generated using [[BibTeX]].

;Style guides
*[http://www.liunet.edu/cwis/cwp/library/workshop/citama.htm AMA Citation Style]
*[http://robertradford.com/Footnotes/footnotes_html/fnotes_html_en.htm How to write footnotes, endnotes and electronic references in a proper format]
*Swarthmore library's Guide to Citation Styles for [http://www.swarthmore.edu/Documents/library/reftip_citesci.pdf Science] and [http://www.swarthmore.edu/Documents/library/reftip_citestyle.pdf Humanities].

;Other online resources
*[http://www.thehistorysite.org thehistorysite.org] Online resources for historical research and writing.

[[Category:Bibliography]]
[[Category:Reference]]

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