@misc{Valerius_Cornelius_(1512-1578)_De,
 author={Valerius, Cornelius (1512-1578)},
 howpublished={online},
 publisher={Ex officina Christophori Plantini [...]},
 language={lat},
 type={stary druk},
 title={De Sphæra, Et Primis Astronomiæ Rvdimentis, Libellvs Vtilissimvs : Cui adiecta sunt breuia quædam de Gæographia præcepta maxime necessaria [...]},
 keywords={16 w., wydawnictwa przed 1800, stare druki, astronomia},
}