APA (American Psychological Association) is most commonly used to cite sources within the social sciences, such as Psychology, Linguistics, Sociology, Economics, and Criminology, as well as Business and Nursing. Always check with your professor/instructor to make sure you are using the correct citation style.
The University Library has two comprehensive Research Guides dedicated to APA style which you can access here:
Below are links for more information on to on how to use APA Style from other sources.
This manual is the definitive source for questions regarding APA citation style. The library owns many copies. Those in Reference are for in-library use only.