@book{46498,
	author = {Purcell, Edwing J. and Varberg, Dale},
	title = {Cálculo con Geometría Analítica.},
	publisher = {Prentice-Hall,},
	year = {1987.},
	address = {México :},
	edition = {4.},
	note = {Incluye índice.}
}