@misc{Weyberg_Zygmunt_(1872-1945)._Świat,
 author={Weyberg, Zygmunt (1872-1945).},
 howpublished={online},
 publisher={Mathesis Polska},
 language={pol},
 title={Świat kryształów},
 type={book},
 type={language document},
}