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Wikipedia Editing Project

Guiding Principles for Citing in Wikipedia

NPOV Neutral Point of View. Avoid stating opinions as fact and representing contested assertions as facts.  Use non-judgmental language and indicate the relative prominence of opposing views.
Verifiability All content attributed to a source
No Original Research  Must be published in a reliable secondary source
Reliable Source must be published
Notability requires the existence of suitable, reliable, and independent sources

Citing sources in Wikipedia

How to add references in Wikipedia