While Wikipedia is a useful tool it is generally not acceptable to use a source in research papers. Try these sources instead:
Evaluating websites can be a tricky business. Whereas books and articles clearly state authors, and very often their credentials and sources, the web is an open content medium, meaning ANYone can publish ANYthing. This includes highly regarded professionals and experts, people trying to sell you something (a product, an opinion, an agenda), and people just using the web as a place to post their opinions.
It takes a careful eye to determine if content on the web is reliable enough to cite in an academic paper. Some important considerations:
These websites can also help you evaluate the bias or "slant" of a particular new story: