APA (7th ed.) Citation

Kolby, J., & Thornburg, S. (2000). GRE prep course: With software. Nova Press.

Chicago Style (17th ed.) Citation

Kolby, Jeff, and Scott Thornburg. GRE Prep Course: With Software. Los Angeles, CA: Nova Press, 2000.

MLA (9th ed.) Citation

Kolby, Jeff, and Scott Thornburg. GRE Prep Course: With Software. Nova Press, 2000.