@book{43723,
	author = {Burns, Robert I. and ebrary, Inc.},
	title = {Underworlds},
	publisher = {University of Pennsylvania Press,},
	year = {2001.},
	series = {The Middle Ages series},
	address = {Philadelphia :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10642195}
}