Kowalski, Ronald I. <br/><br/>
The Bolshevik Party in conflict :  the left communist opposition of 1918 / 
Ronald I. Kowalski 
 - Pittsburg, Pa. :  Univ. of Pittsburgh Press,  1991 
 - X, 244 S. 
 - Series in Russian and East European studies  14 .
<br/><br/><label>ISBN: </label>0822911612