@book{3215,
	author = {Barnett, Raymond A. and Michel R. Ziegler},
	title = {College algebra  /},
	publisher = {McGraw Hill },
	year = {1993},
	series = {Schaums̀ outline series in mathematics and statistics},
	address = {New York  },
	edition = {5a ed.},
	note = {Incluye índice}
}