@book{16385,
	author = {Leff, Lawrence S.},
	title = {Precalculus the easy way /},
	publisher = {Barron's,},
	year = {c2005.},
	series = {Easy way series},
	address = {Hauppauge, N.Y. :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0619/2004062447-d.html}
}