Cita APA (7th ed.)

Kaplan, Inc. (2012). New GMAT essentials 2013. Kaplan Pub.

Cita Chicago (17th ed.)

Kaplan, Inc. New GMAT Essentials 2013. New York: Kaplan Pub, 2012.

Cita MLA (9th ed.)

Kaplan, Inc. New GMAT Essentials 2013. Kaplan Pub, 2012.