Cita APA (7th ed.)

Jaffe, E. D., & Hilbert, S. (2014). Barron's GRE (20th ed.). Barron's.

Cita Chicago (17th ed.)

Jaffe, Eugene D., i Stephen Hilbert. Barron's GRE. 20th ed. Hauppauge: Barron's, 2014.

Cita MLA (9th ed.)

Jaffe, Eugene D., i Stephen Hilbert. Barron's GRE. 20th ed. Barron's, 2014.