APA Style

Dougherty, J, E., Pfaltzgraff, R, L. (2001). Contending theories of international relations : a comprehensive survey (5th ed). New York: Longman.

MLA Style

Dougherty, James, E., Pfaltzgraff, Robert, L. "Contending theories of international relations : a comprehensive survey". 5th ed New York: Longman, 2001. Books.