@book{214900,
	author = {Valdéz Guzmán, Jaime Heriberto and Sánchez Aguirre, Bertha Alejandra},
	title = {Elementos de matemática 1 :},
	publisher = {Nutesa,},
	year = {1990.},
	address = {México, D.F. :},
	edition = {Segunda edición },
	note = {Donación}
}