@book{68084,
	author = {Ganshof, François-Louis. and Valdeavellano, Luis G. de, },
	title = {El feudalismo / },
	publisher = {Ariel, },
	year = {[1974]},
	series = {Ariel quincenal},
	address = {Barcelona, etc. : },
	edition = {[2ª ed.].}
}