APA (7th ed.) Citation

Umar, B., & Pyrdum, C. S. (2017). Barron's GMAT (2nd edition.). Barron's.

Chicago Style (17th ed.) Citation

Umar, Bobby, and Carl S. Pyrdum. Barron's GMAT. 2nd edition. Hauppauge, N.Y.: Barron's, 2017.

MLA (9th ed.) Citation

Umar, Bobby, and Carl S. Pyrdum. Barron's GMAT. 2nd edition. Barron's, 2017.