APA Style is the standard for publications of the American Psychological Association (APA). While originally designed for the field of psychology, the style has been widely adopted by other social and behavioral sciences, e.g., social work, education, sociology. The authoritative source is the Publication Manual of the American Psychological Association. 6th edition (2nd printing).
The links below lead to APA style citation examples from the Online Writing Lab (OWL) @ Purdue University. Follow the formats provided.