APA (7th ed.) Citation

Kolby, J., & Thornburg, S. (2004). Nova's GMAT prep course. Nova Press.

Chicago Style (17th ed.) Citation

Kolby, Jeff, and Scott Thornburg. Nova's GMAT Prep Course. Los Angeles, CA: Nova Press, 2004.

MLA (9th ed.) Citation

Kolby, Jeff, and Scott Thornburg. Nova's GMAT Prep Course. Nova Press, 2004.