@misc{Twardowski_Kasper_(1592?-1641?)_Biy,
 author={Twardowski, Kasper (1592?-1641?)},
 howpublished={online},
 publisher={Szeliga, Jan ( -ca 1637). Druk.},
 language={pol},
 type={stary druk},
 title={Biy Gvstawa Kto Dobry},
}