@misc{Vuelpius_Henricus_(-1560)_Libellvs,
 author={Vuelpius, Henricus (-1560)},
 howpublished={online},
 publisher={Gymnich, Johann (ca 1480-1544). Druk.},
 language={lat},
 type={stary druk},
 title={Libellvs De Commvnibvs Et Vsitatis Arithmeticæ practicæ regulis [...]},
 keywords={Bonifacio, Giovanni Bernardino (1517-1597)},
}