Be sure to use the citation style specified by your instructor. Most social work classes use the APA style guide.
Publication Manual of the American Psychological Association by 
The Bluebook : a uniform system of citation. by This video will walk you through what a citation is and the different parts of a citation.
Direct link to "Anatomy of a Citation" on MSU Mediaspace
Video credit: Megan Kudzia
Are you confused about when to cite? This video will help clear up your questions!
Direct link to "When do I cite?" on MSU Mediaspace
Video credit: Megan Kudzia
Keep a personal database of books, journal articles, websites, and other resources with a citation management program. These programs will help you organize and keep track of resources as well as automatically format citations.
Don't plagiarize! Familiarize yourself with the rules with these resources: