This is not easy to answer. More than 20 people worked on it, generally speaking each one adding a sentence or changing some bit. Each one must have used a different "source of information" — many must have simply used their own knowledge.

However, if there is a particular bit that look to you fishy, that's much easier. Go through the page history (use the history button at the top) and see when it was added and by whom. Then ask that person. People usually respond very nicely to such requests. You might want to read the relevant policy, verifiability.  17:45, 18 Oct 2004 (UTC)