@book{539,
	author = {Purcell, Edwin J. and Varberg, Dale},
	title = {Cálculo con geometría análitica /},
	publisher = {Prentice Hall Hispanoamericana,},
	year = {1993.},
	address = {México :},
	edition = {2a. edición},
	note = {Incluye índice}
}