Knowles, David.
The Middle Ages /
David Knowles, Dimitri Obolensky 
. - London ; New York ; Paramus ; Toronto  : Darton, Longman & Todd ; Paulist Press,  1983 
. - XXXII, 519 p.  ill.  23 cm. 
 - (The Christian centuries  ; v. 1 )
<br/><label>  ISBN: </label>0-8091-0276-5