Help:Introduction to referencing with Wiki Markup

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A cartoon of a political rally, with someone in the crowd holding up a banner reading "[Citation needed]"
"Wikipedian protester" by Randall Munroe, xkcd. Wikipedians famously demand citations for facts!

One of the key policies of Wikipedia is that all article content has to be verifiable. All quotations, any material whose verifiability has been challenged or is likely to be challenged must include an inline citation to a source that directly supports the material. This also means that Wikipedia is not the place for original work, archival findings that have not been published, or evidence from any source that has not been published.

If you are adding new content, it is your responsibility to add sourcing information along with it. Material provided without a source is significantly more likely to be removed from an article. Sometimes it will be tagged first with a "citation needed" template to give editors a chance to find and add sources, but some editors will simply remove it because they question its veracity.

This tutorial will show you how to add inline citations to articles, and also briefly explain what Wikipedia considers to be a reliable source.

Inline citations are usually small, numbered footnotes like this.[1] They are generally added either directly following the fact that they support, or at the end of the sentence that they support, following any punctuation. When clicked, they take the reader to a citation in a reference section near the bottom of the article.

While editing a page that uses the most common footnote style, you will see inline citations displayed between <ref>...</ref> tags.

If you are creating a new page, or adding references to a page that didn't previously have any, remember to add a References section like the one below near the end of the article:

==References==
{{reflist}}
References
  1. ^ Wales, Jimmy (2024). What is an inline citation?. Wikipublisher. p. 6.

WikiEditor-reference toolbar menu-en.png

File:RefTools rework.ogv Manually adding references can be a slow and tricky process. Fortunately, there is a tool called "RefToolbar" built into the Wikipedia edit window, which makes it much easier.

To use it, click on MediaWiki Vector skin action arrow.png Cite at the top of the edit window, having already positioned your cursor after the sentence or fact you wish to reference. Then select one of the 'Templates' from the dropdown menu that best suits the type of source. These are:

  • {{cite web}} for references to general websites
  • {{cite news}} for newspapers and news websites
  • {{cite book}} for references to books
  • {{cite journal}} for magazines, academic journals, and papers

A template window then pops up, where you fill in as much information as possible about the source, and give a unique name for it in the "Ref name" field. Click the "Insert" button, which will add the required wikitext in the edit window. If you wish, you can also "Preview" how your reference will look first.

Some fields (such as a web address, also known as a URL) will have a System-search.svg icon next to them. After filling in this field, you can click it to handily autofill the remaining fields. It doesn't always work properly, though, so be sure to double check it.

Often, you will want to use the same source more than once in an article to support multiple facts. In this case, you can click Named references  Nuvola clipboard lined.svg in the toolbar, and select a previously added source to re-use.

Wikipedia articles require reliable, published sources that directly support the information presented in the article. Now you know how to add sources to an article, but which sources should you use?

The word "source" in Wikipedia has three meanings: the work itself (for example, a document, article, paper, or book), the creator of the work (for example, the writer), and the publisher of the work (for example, Cambridge University Press). All three can affect reliability.

Abstract graphic depicting referencing

Reliable sources are those with a reputation for fact-checking and accuracy. They tend to have an editorial process with multiple people scrutinizing work before it is published. Academic and peer-reviewed publications are usually the most reliable sources. Other reliable sources include university textbooks, books published by respected publishing houses, magazines, journals, and news coverage from mainstream newspapers.

Whether a source is usable also depends on context. Sources that are reliable for some material are not reliable for other material. For instance, otherwise unreliable self-published sources are usually acceptable to support uncontroversial information about the source's author. You should always try to use the best possible source.

Detailed information