@book{227420,
	author = {McKeague, Charles P. and Turner, Mark D.},
	title = {Trigonometry},
	publisher = {Thomson Brooks/Cole},
	year = {c2008.},
	address = {Belmont, CA},
	edition = {6th ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy1104/2007904167-b.html}
}