@book{209018,
	author = {Kolby, Jeff. and Vaughn, Derrick. and ebrary, Inc.},
	title = {GMAT Math prep course},
	publisher = {Nova Press,},
	year = {c2009.},
	series = {PrepCourse series},
	address = {Los Angeles, CA :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10359410}
}