@misc{Gumowski_Marian_(1881-1974)_Biskupstwo,
 author={Gumowski, Marian (1881-1974)},
 howpublished={online},
 publisher={Drukarnia Dziennika Poznańskiego (Poznań)},
 publisher={Filia w Poznaniu (Gebethner i Wolff)},
 language={Polish},
 title={Biskupstwo kruszwickie w XI wieku},
 type={book},
 keywords={church history, Middle Ages, Kruszwica (Kuyavian–Pomeranian Voivodeship)},
}