@misc{Burchardus_Joannes_Ordo,
 author={Burchardus Joannes},
 howpublished={online},
 publisher={Florian Ungler, Kraków},
 language={lat},
 type={mszały},
 type={starodruki},
 title={Ordo missae},
 keywords={liturgia katolicka, 16w., mszał},
}