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A citation, or reference,[1] uniquely identifies a source of information:Wikipedia

A citation, or reference,[1] uniquely identifies a source of information:Wikipedia's Verifiability policy requires inline citations for any material [...]

[not in citation given]The {{Failed verification}} tag will categorise tagged articles into Category:All articles with failed verification

[not in citation given]The {{Failed verification}} tag will categorise tagged articles into Category:All articles with failed verification. This template is a [...]

[citation needed]{{Citation needed}} (also known by the redirects {{Cn}} and {{Fact}}) is a template used to identify claims in articles, particularly if questionable, that need a citation to a reliable source

[citation needed]{{Citation needed}} (also known by the redirects {{Cn}} and {{Fact}}) is a template used to identify claims in articles, particularly if [...]