APA (7th ed.) Citation

Volkell, R. Z. GMAT, graduate management admission test: A test preparation guide.

Chicago Style (17th ed.) Citation

Volkell, Randolph Z. GMAT, Graduate Management Admission Test: A Test Preparation Guide.

MLA (9th ed.) Citation

Volkell, Randolph Z. GMAT, Graduate Management Admission Test: A Test Preparation Guide.

Warning: These citations may not always be 100% accurate.