The Middle Ages /
prepared by National Geographic Book Service 
. - Washington : National Geographic Society,  1977 
. - 378 p.  ill.  27 cm. 
 - (The Story of man  ; 3 )
<br/>К.: Бібліогр. : с. 377, Покажчик 
<br/><label>  ISBN: </label>0-87044-075-6