@misc{Drużbicki_Kasper_(1590-1662)_Observationes,
 author={Drużbicki, Kasper (1590-1662)},
 howpublished={online},
 publisher={Drukarnia Jezuitów},
 language={lat},
 type={starodruk},
 title={Observationes Liturgicæ},
}