Kolby, J., & Vaughn, D. (2009). GMAT Math prep course. Nova Press.
Tohutoru Kātū Chicago (17th ed.)Kolby, Jeff, me Derrick Vaughn. GMAT Math Prep Course. Los Angeles, CA: Nova Press, 2009.
Tohutoro MLA (9th ed.)Kolby, Jeff, me Derrick Vaughn. GMAT Math Prep Course. Nova Press, 2009.
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