Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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