@book {2008,
	title = { The History of Medieval Canon Law in the Classical Period, 1140-1234},
	series = {History of Medieval Canon Law},
	number = {3},
	year = {2008},
	publisher = {The Catholic University Press},
	organization = {The Catholic University Press},
	address = {Washington (D.C.)},
	isbn = {9780813214917},
	author = {Hartmann, Wilfried and Pennington, Kenneth}
}
