Citation Needed Shopping
Sources
Website Links For
Sources
 

Information About

Citation Needed




This page is a style guide, describing how to write citations in articles. Providing sources for edits is mandated by and , which are policy. This means that any material that is challenged and has no source may be removed by any editor. See those pages and for more information.


WHY SOURCES SHOULD BE CITED


  • To ensure that the content of articles is credible and can be checked by any reader or editor.

  • To enhance the overall credibility and authoritative character of Wikipedia.

  • To show that your edit isn't .

  • To reduce the likelihood of editorial disputes, or to any that arise.

  • To credit a source for providing useful information and to avoid claims of Plagiarism .


Note: Wikipedia articles can't be used as sources.


WHEN TO CITE SOURCES



When you add content


If you add any information to an article, particularly if it's contentious or likely to be challenged, you should supply a source. If you don't know how to format the citation, others will fix it for you. Simply provide any information you can.

In general, even if you are writing from memory, you should actively search for authoritative references to cite. If you are writing from your own knowledge, then you should know enough to identify good references that the reader can consult on the subject — you will not be around forever to answer questions. The main point is to '''help the reader''' and other editors.

The need for citations is especially important when writing about opinions held on a particular issue. such as, "Some people say…" Instead, make your writing : find a specific person or group who holds that opinion, mention them by name, and give a citation to a reputable publication in which they express that opinion. Remember that Wikipedia is not a place for expressing your own opinions or for .

Because this is the English Wikipedia, English-language sources should be given whenever possible, and should always be used in preference to foreign-language sources of equal calibre. However, do give foreign-language references where appropriate. If quoting from a foreign-language source, an English translation should be given with the original-language quote beside it.


When you verify content


You can add sources even for material you didn't write if you use a source to '''verify''' that material. Adding citations to an article is an excellent way to contribute to Wikipedia. See and for organized efforts to do this. Direct quotes, used as a method of easing factual verification, can be provided (in whatever format is agreed on by the main editors of the article) for any statement.


Text that is, or is likely to be, disputed


Disputed text can immediately be removed entirely or moved from the article to the talk page for discussion. If the disputed text is harmless, and you simply feel a citation is appropriate, place (or ) after the text. The template can be useful for flagging quotations taken out of context and other misuse of citations. Unsourced criticism or negative material in the biographies of living persons should be removed immediately, and not moved to talk. See and .

Think ahead. Try to imagine whether people might doubt what you wrote, or need more information about it. Supporting what is written in Wikipedia by referring to a clear and reliable source will add stability to your contribution.


Say where ''you'' got it


A common error is to copy citation information from an intermediate source without acknowledging it. For example, you might find some information on a web page which says it comes from a certain book. Unless you look at the book yourself to check that the information is there, your citation must mention the web page. Your citation might ''only'' mention the web page, or you can provide further information like this:

  • , which cites , or

  • , cited at .


However, you shouldn't cite ''only'' the book unless you looked at it yourself. If you checked the book, it is no longer necessary to mention the web page but you can still mention it if that would be useful information for readers. You can do so using a form like this:

  • (also see ).


The purpose of this rule is to enable readers to judge the reliability of the evidence and to enable them to verify it to at least the same extent as you did.


HOW TO CITE SOURCES


  • When writing a new article or adding references to an existing article that has none, follow the ''established practice'' for the appropriate profession or discipline that the article is concerning (if available and unquestioned).

  • An article's previous content contributors usually know the established practice - if possible, follow their lead if the article already has references.

  • If the established practice is unavailable or disputed, contributors should decide on a style that they believe strikes an appropriate balance between preserving the readability of the text and making citations as precise and accessible as possible.

  • If contributors differ as to the appropriate style of citation, they should defer to the article's main ''content contributors'' in deciding the most suitable format for the presentation of references. If no agreement can be reached, the citation style used should be that of the first major contributor.


If you are unclear as to which system or style to use, remember: the most important thing is to provide all the information one would need to identify and find the source. If necessary, put this information in the talk page, or in a comment on the main page, and ask others how to format it correctly for that article.

See below for a discussion of different citation styles.

  • For an easy-to-follow guide, see ''

  • Further assistance may be derived from WikiBib , a simple bibliography maker written in Javascript that has most of these templates built in. (Note: WikiBib uses a deprecated template for book references.)

  • Landmark Citation Machine is also good for making bibliographies. It is regularly updated and runs on three separate servers.


The system of presenting references in a Wikipedia article may change over time; it is more important to have clarity and consistency in an article than to adhere to any particular system.

Remember: the most important thing is to enter comprehensive reference information — that is, enough information so that a reader can find the original source with relative ease.


Citation styles


The following are different methods that you can use to insert references in Wikipedia articles.

can be made using the (preferred), or for certain specific technical areas.


Embedded HTML links


The MediaWiki software supports embedding HTML links directly into an article by enclosing a URL with single square brackets — — which appears like this: [http://www.google.com [1 ] A full citation ought then be given in the References section like this:



A newspaper article referenced in an article by using an embedded link might be — — which looks like this. [http://media.guardian.co.uk/site/story/0,14173,1601858,00.html [2 ] The embedded link is placed after the period, or when placed within a sentence after a clause, then after the comma.

Then in the References section, a full citation is provided:


which appears as:


It is particularly important in the case of online newspaper articles to include byline, headline, newspaper, and date of publication, because many newspapers keep stories online only for a certain period before transferring them to the archives. With a full citation, readers will be able to find the article easily even if the link doesn't work.

It's also important to provide and place in quotation marks the headline of the article, or title if it's a scholarly paper, so that Wikipedia is attributing a description of the article's contents to a source, and not describing it ourselves. For example, it isn't Wikipedia's claim that Sorrell is accusing Murdoch of panic buying, but the ''Guardian's'', and we should therefore quote the ''Guardian's'' headline, and not replace it with "A story about Murdoch's panic buying".

Advantages of these embedded links are that it is easy for readers and other editors to click on the links and jump immediately to the cited article, which makes checking sources very easy, and that the links are easy to create and maintain.

Disadvantages are that anyone who takes a random sample of these will find dead embedded links. Also, such links do not normally provide all the information that a traditional citation would have; thus, if the material moves or is dramatically changed, it can be difficult to rediscover the cited material, which is why it is important to include a full citation in the References section, just as you would with any other citation style.


Harvard referencing


The Harvard Referencing System places a partial citation — the author's name and year of publication within parentheses — in the text itself, and a complete citation at the end of the text in an alphabetized list of "References". According to ''The Oxford Style Manual'', the Harvard system is the "most commonly used reference method in the physical and social sciences" (Ritter 2002).

  • For one author, add the author's surname and the year of publication in parentheses (round Bracket s) after the sentence or paragraph, and before the period: for example (Smith 2005).

  • For two authors, use (Smith & Jones 2005); for more authors, use (Smith et al. 2005).

  • If the "References" section contains two or more works by the same author but published the same year, use a letter after the year to distinguish the different sources (for example, (Smith 2005a) and (Smith 2005b). ''Make sure that the in-text citations use the correct letters that correspond to the full citation in the "References" at the end of the article.''


  • If the date of publication is unavailable, use "n.d." (meaning, no date)


  • Many times authors use an edition of a book that was published long after the original publication. In such cases, many people put the original date of publication in square brackets followed by the date of publication of the edition used by the author who is making the citation. For example, a citation might be

  • :: (Marx {Link without Title} 1967)

: And the complete reference would be:
:: Marx, Karl {Link without Title} 1967 '' Capital: A Critique of Political Economy'' Vol. I. Edited by Frederick Engels. New York: International Publishers.
  • When providing a page number, the convention is (Smith 2005:73).

  • For a quotation that is within the text and marked by quotation marks, the citation follows the end-quotation mark ("), and precedes the period (.)

  • For a quotation that is indented, the citation follows the period.

  • When the author of the reference is named as part of the text itself, put the year in parentheses; for example "Smith (2005) says..."


Note: Harvard referencing is not complete without the full citation at the end of the page (article) in the References section.


Complete citations in a "References" section



REFERENCES


References typically include: the name of the author, the title of the book or article, and the date of publication. Different professions, academic disciplines, and publishers have different conventions as to the order in which this information should be arranged, or whether additional information is required. Usually, the list is in alphabetical order by the author's surname. The name of the publisher and its city is optional. The ISBN of a book is optional. Journal articles should include volume number, issue number and page numbers, if available.

Typical references would be:


or using a template (see source):