@misc{Wolff_Franz_(1858–1931)_Lehrbuch_1860,
 author={Wolff, Franz (1858–1931)},
 copyright={Domena Publiczna},
 address={Berlin},
 howpublished={online},
 year={1860},
 publisher={Georg Reimer},
 language={ger},
 type={Tekst},
 title={Lehrbuch der Geometrie. 1 Theil, Ebene Elementar-Geometrie, Trigonometrie, Theilungslehre},
 URL={http://rcin.org.pl./Content/69714/PDF/WA35_12538_7247-I_Lehrbuch.pdf},
}