@misc{_De,
 howpublished={online},
 publisher={Ex Typographia Reverendae Camerae Apostolicae},
 language={lat},
 type={druki},
 title={De ritu et usu cerearum formarum que benedici, et consecrari solent a Romano Pontifice},
 keywords={Grzegorz XII (papież), obrzędy, liturgia katolicka},
}