This guide is an introduction to the APA (American Psychological Association) referencing system.
It is based on, and gives credit to the information given in the APA's official style guide:
American Psychological Association. (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author.
Before you write your reference list or bibliography, check with your lecturer/tutor which style they prefer you to use and refer to the instructions included with your assignment.
Information about why you need to reference is available in the Referencing & plagiarism guide.