Your instructor requires the use of the Publication Manual of the American Psychological Association, also just know as the APA Manual, when citing your sources. There is a print copy behind the Reference Desk on the first floor of Waldo Library under the call number BF 76.7 .P83 2010.
OWL -- The Online Writing Lab at Purdue University
The Writing Lab at Purdue University does a superb job of helping to guide students in the use of the writing style guides. Be sure and visit their site once you have put your own citations into the proper format to see check your work.