Horak, Stephan M. 1920-1986.
Poland and her national minorities, 1919-39: a case study /
Stephan Horak 
. - New York : Washington : Hollywod : Vantage Press,  1961 
. - 259 p.  map.  21 cm. 
<br/>К.: Бібліогр. : c. 232-254, Index