@misc{Sebastian_z_Felsztyna_(około_1485-po_1543)_Opusculum,
 author={Sebastian z Felsztyna (około 1485-po 1543)},
 address={Kraków},
 howpublished={online},
 publisher={Wietor, Hieronim (po 1480-1546/47). Druk},
 language={lat},
 title={Opusculum Musices nouiter congestum (...) pro institutione adolescentum in cantu simplici, seu Gregoriano. Addita est Musica Figuratiua (...)},
 type={stary druk},
}