APA (7th ed.) Citation

Kolby, J. &. o. (2015). GMAT: DATA Sufficiency Prep Course. Prakash Pub.

Chicago Style (17th ed.) Citation

Kolby, Jeff & others. GMAT: DATA Sufficiency Prep Course. New Delhi: Prakash Pub, 2015.

MLA (9th ed.) Citation

Kolby, Jeff & others. GMAT: DATA Sufficiency Prep Course. Prakash Pub, 2015.