APA (7th ed.) Citation

Pack, P. E. (2001). CliffsAP biology (2nd ed.). IDG Books Worldwide.

Chicago Style (17th ed.) Citation

Pack, Phillip E. CliffsAP Biology. 2nd ed. Foster City, CA: IDG Books Worldwide, 2001.

MLA (9th ed.) Citation

Pack, Phillip E. CliffsAP Biology. 2nd ed. IDG Books Worldwide, 2001.