Kolby, J. &. o. (2015). GMAT: DATA Sufficiency Prep Course. Prakash Pub.
Chicago Style (17th ed.) CitationKolby, Jeff & others. GMAT: DATA Sufficiency Prep Course. New Delhi: Prakash Pub, 2015.
MLA (9th ed.) CitationKolby, Jeff & others. GMAT: DATA Sufficiency Prep Course. Prakash Pub, 2015.
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