@book{15698,
	author = {Vann, Theresa,},
	title = {On the Social Origins of Medieval Institutions :},
	publisher = {BRILL,},
	year = {1998.},
	series = {The Medieval Mediterranean ;},
	address = {Leiden; },
	url = {http://dx.doi.org/10.1163/9789004477650}
}