Koenigsberger, Helmut Georg. <br/><br/>
Medieval Europe 400-1500 / 
H.G. Koenigsberger. 
 - London :   Longman,   1987. 
 - History of Europe .
<br/><br/><label>ISBN: </label>0582494036 (pbk) 0582494044 
<br/><br/><label>LC Class. No.: </label>D117