@misc{Borel_Émile_(1871-1956)_Trygonometrja,
 author={Borel, Émile (1871-1956)},
 howpublished={online},
 publisher={M. Kuhnke i S-ka},
 language={pol},
 type={podręcznik},
 title={Trygonometrja},
 keywords={trygonometria - podręczniki},
}