Vlasto, A. P..
The entry of the Slavs into Christendom: an introduction to the medieval history of the Slavs /
A.P. Vlasto 
. - Cambridge : University Press,  1970 
. - xii, 435 p.  map.  24 cm. 
<br/>К.: Бібліогр. : c. 407-422, Index 
<br/><label>  ISBN: </label>0-521-07459-2