APA (7th ed.) Citation

The staff of Kaplan test prep and admissions. (2008). GMAT math workbook (6th ed.). Kaplan Pub.

Chicago Style (17th ed.) Citation

The staff of Kaplan test prep and admissions. GMAT Math Workbook. 6th ed. New York: Kaplan Pub, 2008.

MLA (8th ed.) Citation

The staff of Kaplan test prep and admissions. GMAT Math Workbook. 6th ed. Kaplan Pub, 2008.