There are quite a few different ways to cite resources in your paper. The citation style usually depends on the academic discipline involved. For example:
These are some of the most commonly used citation styles, yet there are many more styles. Check with your professor to make sure you use the required style. And whatever style you choose, BE CONSISTENT!
"The purpose of a research paper is to synthesize previous research and scholarship with your ideas on the subject. Therefore, you should feel free to use other persons' words, facts, and thoughts in your research paper, but the material you borrow must not be presented as if it were your own creation."
MLA Handbook for Writers of Research Papers. 7th Edition. New York: MLA. 55. Print.