@misc{Johannes_de_Sacrobosco_(c._1195_–_c._1256)_Spaera,
 author={Johannes de Sacrobosco (c. 1195 – c. 1256)},
 address={Venezia},
 howpublished={online},
 publisher={Bevilaqua, Simon},
 language={lat},
 type={tekst},
 title={Spaera mundi / Cum commentariis Cicchi Esculani, Francisci Capuani, Iacobi Fabri Stapulensis.},
 keywords={13 w., astronomia, nauka, podręczniki akademickie, traktat, matematyka},
}