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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 [...]

Wikipedia is a wiki, meaning that anyone can edit any unprotected page and improve articles immediately for all readers

Wikipedia is a wiki, meaning that anyone can edit any unprotected page and improve articles immediately for all readers. You do not need to register to do [...]

As per the licensing update vote result and subsequent (May 2009) Wikimedia Foundation Board resolution, any content on Wikimedia Foundation projects currently available under GFDL 1

As per the licensing update vote result and subsequent (May 2009) Wikimedia Foundation Board resolution, any content on Wikimedia Foundation projects currently [...]