@book{13881,
	author = {Barnett, Raymond A. and Ziegler, Michael R.},
	title = {College algebra.},
	publisher = {McGraw Hill,},
	year = {2001.},
	series = {Barnett, Ziegler & Byleen's precalculus series},
	address = {Boston :},
	edition = {7th ed. /},
	note = {Includes indexes.},
	url = {http://www.loc.gov/catdir/enhancements/fy0668/00035143-d.html}
}