@misc{Hass_Ludwik_(1918–2008)_PPS_1961,
 author={Hass, Ludwik (1918–2008)},
 volume={4},
 editor={Institute of History of the Polish Academy of Sciences},
 copyright={Rights Reserved - Free Access},
 address={Warsaw},
 journal={Najnowsze Dzieje Polski : materiały i studia z okresu 1914-1939},
 howpublished={online},
 year={1961},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 type={Text},
 title={PPS Lewica 1926-1931},
 URL={http://rcin.org.pl/ihpan/Content/44650/PDF/WA303_59842_A288-4-1961-NDP14-39_Hass.pdf},
 keywords={Polish Socialist Party - Left Wing (1926-1931) - history - sources, Poland - 1918-1939 (Second Polish Republic) - politics and government},
}