@book{34963,
	author = {Barbero, Abilio. and Vigil Pascual, Marcelo.},
	title = {La formación del feudalismo en la Península Ibérica},
	publisher = {Editorial Crítica},
	year = {c1978.},
	series = {Critica. Historia},
	address = {Barcelona},
	note = {Includes indexes.}
}