When writing a research paper you will use a wide variety of resources. You are required to cite your sources for two main reasons:
For more information, check out Why We Cite and How to Avoid Plagiarism.
Citing sources in the body of your essay -
APA Style Guide (Official Copy)
The Library has multiple copies of the Publication manual of the American Psychological Association (6th edition). It is available at the following locations:
Concise Rules of APA Style is the official short and easy-to-use version and is also available for 2-hour loan.