@book{130156,
	author = {Petit-Dutaillis, Charles},
	title = {La monarquía feudal en Francia y en Inglaterra (Siglos X al XIII)},
	publisher = {Unión Tipográfica Editorial Hispano Americana},
	year = {1961},
	address = {México},
	note = {Translation of : The feudal monarchy in France and England : from the tenth to the thirteenth century}
}