When you use someone else's words or ideas in your papers, you should create In-text citations (within the paper) and References list citations (at the end of the paper). Each In-text citation should lead to a References list citation, and each References list citation should come from an In-text citation.
American Psychological Association (APA) Style
Use the Publication manual of the American Psychological Association (6th edition) to correctly cite your sources and format your literature review.
Use the APA Style website or take the Basics of APA Style tutorial for help with putting together your citations and formatting your literature review. Read through the short blog entry The Proper Use of Et Al in APA Style for explanations and examples of how to handle in-text and Reference List citations for various numbers of authors.