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Now you know ''how'' to add sources to an article, but ''which'' sources should you use? Wikipedia articles require '''reliable, published sources''' that directly support the information presented in the article.
The word "source" in Wikipedia has three meanings: the work itself (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.
As a general rule of thumb, the more people engaged in checking facts, analyzing legal issues, and scrutinizing the writing of a publication, the more reliable it is. 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. (<small>Be aware that some news organisations and magazines host "blogs" on their websites. These are often not subject to the same editorial oversight as the main articles, so may be less reliable.</small>)
'''Self-published media''' where the author and publisher are the same, such as books, patents, newsletters, personal websites, open wikis, personal or group blogs and tweets, are largely '''not''' acceptable as sources. However if an author is an established expert with a previous record of third-party publications on a topic, their self-published work ''may'' be considered reliable for that topic, though third-party publications are still preferable.
Whether a source is usable also depends greatly on context. For information about '''living people''', only the most reliable sources should be used. On the other hand self-published sources can ''sometimes'' be used as sources of information about themselves.
These are general guidelines, but the topic of reliable sources is a complicated one which it is impossible to fully cover here. You can find more information on the [[Wikipedia:Verifiability|Verifiability policy page]] and at [[Wikipedia:Identifying reliable sources]].
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