I'm kinda new to academia and was wondering how citations are done. In particular, say I wanted to cite the "Inspiration, pure and applied mathematics, and aesthetics" of this article: http://en.wikipedia.org/wiki/Mathematics
Would I cite the whole article, or is there a way of citing just the part I want?
Also, who do I mention as the author of a Wikipedia article?
Lastly, what format would is commonly used for writing such a reference?