@book{203664,
	author = {Larson, Ron and Hostetler, Robert P. and Houghton Mifflin Company.},
	title = {Precalculus},
	publisher = {Houghton Mifflin},
	year = {c2007.},
	address = {Boston},
	edition = {7th ed.},
	note = {Includes index.}
}