Jakobson, Roman.
Early Slavic paths and crossroads. Pt. 1 : Comparative Slavic studies: the Cyrillo-Methodian tradition /
edited, with a preface, by Stephen Rudy 
. - Berlin : New York : Amsterdam : Mouton Publishers,  1985 
. - xxiii, 401 p.  25 cm. 
<br/><label>  ISBN: </label>0-89925-050-5