Jakobson, Roman.
Early Slavic paths and crossroads. Pt. 2 : Medieval Slavic studies /
edited, with a preface, by Stephen Rudy 
. - Berlin : New York : Amsterdam : Mouton Publishers,  1985 
. - viii, p. 403-942  ill., schem., tab.  25 cm. 
<br/><label>  ISBN: </label>0-89925-062-9