@book{32640,
	author = {Aufmann, Richard N. and Barker, Vernon C.},
	title = {College trigonometry /},
	publisher = {Houghton Mifflin Co.,},
	year = {c1990.},
	series = {College algebra and trigonometry series},
	address = {Boston, MA :},
	note = {Includes index.}
}