Bury, J.B. <br/><br/>
The Cambridge Medieval History ( Volume VI Victory of The Papacy ) 
/ by J.B. Bury 
 - London,  Cambridge University Press:  1968. 
 - xli, 1047p. 
<br/><br/><label>ISBN: </label>52104538X 
<br/><br/><label>Dewey Class. No.: </label>909.07  / BUR/T