Twersky, Isadore.
Rabad of Posquir̈es: a twelfth-century Talmudist /
Isadore Twersky 
. - Revised edition 
. - Philadelphia : Jewish publication society of America,  1980 
. - xxv, 368 p.  21 cm. 
<br/>К.: Бібліогр. : c. 307-343, Index 
<br/><label>  ISBN: </label>0-8276-0123-9