Kolby, J. (2013). Nova's GRE prep course: Kolby, Jeff.
Cita Chicago (17th ed.)Kolby, Jeff. Nova's GRE Prep Course: Kolby, Jeff. Nova Press, 2013.
Cita MLA (9th ed.)Kolby, Jeff. Nova's GRE Prep Course: Kolby, Jeff. 2013.
Atenció: Aquestes cites poden no estar 100% correctes.