Although Wikipedia is a good place to start your research, it is not a credible source that you should use to cite from. Wikipedia allows multiple users to edit, and it is not safe to assume that the facts presented there have been checked before publishing them. Wikipedia's policy does say that references should be used whenever possible, but the quality of these references is questionable, because people who are not experts in a field can update a page anytime to reflect whatever information they feel to be true and even back it up with heavily biased sources.
From a research standpoint, you want to be able to back up the information you're presenting in an academic paper with factual, verifiably correct information. This often means using sources that collect that type of information - like library databases!