@book{36841,
	author = {Barnett, Raymond A. and Ziegler, Michael R.},
	title = {Precalculus :},
	year = {McGraw-Hill,},
	address = {Boston, MA :},
	edition = {6th ed.},
	note = {Instructions for creating your MathZone account: Go to www.mathzone.com using your web browser; Record your MathZone registration code: 3XBS-8G8J-UE9M-G0NC-PABE}
}