Wikipedia:Citing sources

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A citation is a line of text that uniquely identifies a source. For example:

Ritter, Ron. The Oxford Style Manual. Oxford University Press, 2002, p. 1.

When and why to cite sources: The policy on sourcing is Verifiability. This requires inline citations for any material challenged or likely to be challenged, and for all quotations. The policy is strictly applied to all material in the mainspace—articles, lists, captions, and sections of articles—without exception. In the event of a contradiction between this page and the policy, the policy takes priority, and this page should be updated to reflect it. Sourcing also applies to images: when an image is uploaded, the uploader must say where the image came from and indicate its copyright status.

How to write citations: Each article should use the same citation method throughout. If an article already has citations, adopt the method in use or seek consensus on the talk page before changing it. While you should try to write citations correctly, what matters is that you provide enough information to identify the source. Others will improve the formatting if needed.

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