Articles that rely on primary sources should only make descriptive claims that can be checked by anyone without specialist knowledge.
    Primary sources are documents or people close to the situation you are writing about. An eyewitness account of a traffic accident, and the White House's summary of a president's speech are primary sources. Primary source material that has been published by a reliable source may be used for the purposes of attribution in Wikipedia, but only with care, because it's easy to misuse primary sources. The Bible cannot be used as a source for the claim that Jesus advocated eye removal (Matthew 18:9, Mark 9:47) for his followers, because theologians differ as to how these passages should be interpreted. Edits that rely on primary sources should only make descriptive claims that can be checked by anyone without specialist knowledge. See examples of primary sources. 

http://en.wikipedia.org/wiki/Wikipedia:Attribution