@misc{_Arithmetica,
 howpublished={online},
 publisher={Lob Mikołaj},
 language={lat},
 type={starodruk},
 title={Arithmetica practica in usum Scholarum Societatis Jesu opera PP. eiusdem Societatis conscripta},
 keywords={arytmetyka 17w., matematyka 17w.},
}