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One of the key policies of Wikipedia is that all article content has to be verifiable. This means that reliable sources must be able to support the material. All quotations, any material whose verifiability has been challenged or is likely to be challenged, and contentious material (whether negative, positive, or neutral) about living persons 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 more likely to be removed from an article. Sometimes such material will be tagged first with a {{citation needed}} template to give editors time to find and add sources before it is removed, but sometimes editors will simply remove it because they question its veracity.
How to add sources?
editIf you've read many Wikipedia articles, then you've seen plenty of inline citations. These 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 full source in a reference section near the bottom of the article.
When editing a page using the popular (most common) footnote style, inline citations are usually placed <ref>...</ref>
tags. Note the closing slash ("/") in the second tag.
The information within references is displayed together in one place on a page, wherever <references/>
or, most commonly, the template {{Reflist}}
is present. This will usually be in a section titled "References". 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. The Manual of Style describes where to place such a section.
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 activate it, simply click on Cite at the top of the edit window. Position the edit window cursor after the fact or sentence you wish to reference, and then select one of the templates from the dropdown menu. There are different templates suitable for different types of sources:
{{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
This will pop up a window, where you fill in as much information as possible about the source, and give a unique name for it in the "Name" field. Click the "Insert" button, which will add the required wikitext in the edit window.
Some fields (such as a web address, also known as a URL) will have a 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 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 in the toolbar, and select a previously added source to re-use.
What is reliable?
editAs a general rule, more reliable sources have more people engaged in checking facts, analyzing legal issues, and scrutinizing the writing in a publication. 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 mainstream newspapers. (Be aware that some news organisations and magazines, such as CNN's iReport, host "blogs" and user-written articles on their websites. These may be reliable if they are written by the publisher's professional writers, but posts by readers are not usually considered reliable sources.)
Self-published media, where the author and publisher are the same, including newsletters, personal websites, books, patents, open wikis, personal or group blogs, and tweets, are usually not acceptable as sources. The general exception is where the author is an established expert with a previous record of third-party publications on a topic; in this case, their self-published work may be considered reliable for that topic (but not other topics). Even then, third-party publications are still preferable.
What has to be sourced
editWhether a source is usable also depends on context. Sources that are reliable for some material are not reliable for other material. You should always try to find the best possible source for the information you have. For information about living people, only the most reliable sources should be used. On the other hand, self-published sources written by articles' subjects can sometimes be used as sources of information about themselves.
- All article content must be verifiable, that is, possible to support with a reliable, published source.
- All quotations, any material whose verifiability has been challenged or is likely to be challenged, and contentious material, whether negative, positive, or neutral, about living persons, must include an inline citation.
More detailed information
editFootnote example
edit- ^ Wales, J (2024). What is an inline citation?. Wikipublisher. p. 6.