@book{30030,
	author = {Escalona, Eduardo},
	title = {Las grandes épocas de la humanidad  },
	publisher = {Ediciones Culturales },
	year = {2007},
	series = {Coleccion de la naturaleza de Time Life},
	address = {México  },
	edition = {60a.ed.},
	note = {Incluye indice}
}