@misc{Lefébure_de_Fourcy_Louis_Etienne_(1785–1869)_Trygonometrya_1850,
 author={Lefébure de Fourcy, Louis Etienne (1785–1869)},
 editor={Bernhardt, August F. Transl.},
 copyright={Public Domain},
 address={Warszawa},
 address={(Warszawa)},
 howpublished={online},
 year={1850},
 publisher={nakł. tłumacza},
 publisher={(w Drukarni Gazety Codziennej)},
 language={pol},
 title={Trygonometrya płaska i kulista},
 title={Trygonometria płaska i kulista},
 type={Text},
 URL={http://rcin.org.pl/Content/2017/PDF/WA35_5704_6474_Trygonometrya-plaska-i-kulista.pdf},
}