@misc{Killing_Wilhelm_(1847–1923)_Handbuch_1910,
 author={Killing, Wilhelm (1847–1923)},
 editor={Hovestadt, Heinrich (1850– )},
 copyright={Public Domain},
 address={Leipzig},
 address={Berlin},
 howpublished={online},
 year={1910},
 publisher={Druck und Verlag von B. G. Teubner},
 language={ger},
 title={Handbuch des mathematischen Unterrichts. Bd. 1},
 type={Text},
 URL={http://www.rcin.org.pl/Content/68612/PDF/WA35_6853_4467-I_Handbuch.pdf},
}