Most books on biology have call numbers that start with Q, located on the upper level.
In a library database
In one of these organism databases
If you need a book or article that PSU does not have you can request the article through Interlibrary Loan.
This service is free to all PSU students, faculty, and staff.
EasyBib can help you create, manage, and save citations in a variety of citation styles.
Below are links to the style manuals for some other common citation styles.
The Purdue OWL has great information on APA, MLA, and Chicago.