Publication Manual of the American Psychological Association by 
MLA Handbook by 
AMA Manual of Style by 
The Chicago Manual of Style by Choosing A Style
There are quite a few different ways to properly cite resources in your paper. The citation style usually depends on the academic discipline involved. For example:
MLA style (Modern Language Association) is typically used by the Humanities
APA style (American Psychological Association) often is used by Education, Psychology, and Business
Chicago (Professor Turabian, University of Chicago) is generally used by History and some of the Fine Arts.
When determining which style to use there are several resources to keep in mind:
Ask your professor which style s/he prefers for the course.
Consult a style guide for examples of using various citation styles to create in-text citations, bibliographies and reference lists, or use citation software to assist you in tracking sources used and building in-text citations and bibliographies.
The Writing Center in room 204 in Welder. Non-main campus students can access the Writing Center by sending an e-mail to writingcenter@umary.edu. You need to attach information about the assignment and the rough draft on which you are seeking feedback.
Bottom line: Check with your professor to make sure you use the style required for that class. And whatever style you choose, BE CONSISTENT!
Use Mendeley tools and free services to help you organize and cite your references.