@misc{_Kalendarz_1931,
 copyright={Public Domain},
 address={Warszawa},
 howpublished={online},
 year={1931},
 publisher={nakł. Wydaw. "Gospodarz Polski"},
 language={pol},
 type={Text},
 title={Kalendarz Gospodarza Polskiego na rok...},
 keywords={Polish calendars - 1918-1939},
}