@book{34678,
	author = {López-Portillo y Rojas, José, and Villaseñor y Villaseñor, Ramiro.},
	title = {Fuertes y débiles/},
	publisher = {Porrúa  },
	year = {1982.},
	series = {Sepan cuantos..;},
	address = {México },
	edition = {2a ed.}
}