@book{620,
	author = {Valenzuela Velázquez, Juan Bautista. and Torre Villar, Ernesto de la, pról. y notas},
	title = {Elogio y defensa del libro /},
	publisher = {UNAM,},
	year = {1999},
	series = {Colección biblioteca del editor},
	address = {México :},
	edition = {4}
}