Pennington, Kenneth.
Pope and bishops: the papal monarchy in the twelfth and thirteenth centuries /
Kenneth Pennington 
. - Philadelphia : University of Pennsylvania Press,  1984 
. - xiii, 225 p.  24 cm. 
 - (The Middle Ages )
<br/>К.: Бібліогр. : c. 196-214, Index 
<br/><label>  ISBN: </label>0-8122-7918-2