@misc{Bertrand_Joseph_(1822–1900)_Traité_1885,
 author={Bertrand, Joseph (1822–1900)},
 copyright={Public Domain},
 address={Paris},
 howpublished={online},
 year={1885},
 publisher={Librarie Hachette et Cie},
 language={fre},
 title={Traité d'arithmétique},
 type={Text},
 URL={http://rcin.org.pl/Content/69068/PDF/WA35_17309_6209_Traite.pdf},
}