Tabacco, Giovanni.
The struggle for power in medieval Italy: structures of political rule /

. - Cambridge ; New York ; Port Chester  : Cambridge University Press,  1989 
. - VI, 353 p.  21 cm. 
 - (Cambridge medieval textbooks )
<br/>К.: Бібліогр. : с. 345-349 
<br/><label>  ISBN: </label>0-521-33680-5