@book{98085,
	author = {Romero, José Luis,  and Le Goff, Jacques, },
	title = {Crisis y orden en el mundo feudoburgués /},
	publisher = {Siglo Veintiuno,},
	year = {2003.},
	series = {Colección Historia y cultura},
	address = {Buenos Aires :},
	edition = {1a. ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0905/2004392914-d.html}
}