@book{30875,
	author = {O'Callaghan, Joseph F. and ebrary, Inc.},
	title = {The Gibraltar crusade},
	publisher = {University of Pennsylvania Press,},
	year = {c2011.},
	series = {The Middle Ages series},
	address = {Philadelphia :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10641593}
}