@book{36544,
	author = {Smith, Karl J.},
	title = {Essentials of trigonometry /},
	publisher = {Thomson Brooks/Cole,},
	year = {c2006},
	address = {Belmont, CA :},
	edition = {4th ed.},
	note = {Includes index},
	url = {http://www.loc.gov/catdir/toc/fy0703/2005930473.html}
}