I like Wikipedia less and less. It contains lots of errors and copied content (the latter including stuff from my own site). To be fair there are people who take out material that is in breach of copyright, but what often then happens is they re-phrase the content (not usually very well).

Why not use Google to look for sources that are further upstream.

Wikipedia is good in some areas (especially geeky stuff in general), but outside those areas, I tend to avoid it.