@misc{Wróbel_Walenty_Opusculum,
 author={Wróbel, Walenty},
 address={Lipsiae},
 howpublished={online},
 publisher={Lotter Melchior},
 language={lat},
 title={Opusculum quadragesimale},
 type={starodruk},
 keywords={Polska -- 16 w., Early printed books -- 16th century, Sixteenth century},
}