@book{2946,
	author = {Barnett, Raymond A. and Ziegler, Michae R.},
	title = {Essentials of college mathematics  },
	publisher = {Macmillan, },
	year = {1992},
	series = {College mathematics series},
	address = {New York  },
	edition = {2a ed.},
	note = {Incluye indice}
}