Vernadsky, George 1887-1973.
The Mongols and Russia /

. - New Haven : London : Yale University Press,  1970 
. - xii, 462 p.  map.  24 cm. 
<br/>К.: Бібліогр. : c. 418-424, Index 
<br/><label>  ISBN: </label>0-300-1008-7