Hagen, William W.  (1942- ) <br/><br/>
Germans, Poles and Jews :  the nationality conflict in the Prussian East, 1772-1914 / 
William W. Hagen. 
 - Chicago :  The University of Chicago Press,  1980. 
 - IX, [1], 406 s., [4] k. tabl. :  il. ;  22 cm.