"There are three reasons to cite the materials you use:
- To give credit to others' work and ideas, whether you agree with them or not. When you use their words, you must give them credit by using both quotation marks and citations.
- To show readers the materials on which you base your analysis, your narrative, or your conclusions.
- To guide readers to the materials you have used so they can examine it for themselves. Their interest might be to confirm your work, to challenge it, or simply to explore it further."
Lipson, Charles. Cite Right: A Quick Guide to Citation Styles-Mla, Apa, Chicago, the Sciences, Professions, and More. Chicago: University of Chicago Press, 2011. Print.