@book{3578,
	author = {Barnett, Raymond A ; Ziegler Michall R and Bylen, Karl E,},
	title = {Precalculus Functions and graphs /},
	publisher = {MC Graw- Hill higher education,},
	year = {c2001},
	address = {MC Graw- Hill higher education,},
	edition = {5th}
}