@book{17847,
	author = {Larson, Ron. and Hostetler, Robert P.},
	title = {Trigonometry :},
	publisher = {Houghton Mifflin Co.,},
	year = {2001.},
	address = {Boston, MA :},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1302/2003113995-b.html}
}