@misc{Nagel_Karl_Fossilium,
 author={Nagel, Karl},
 howpublished={online},
 publisher={W. Junk},
 language={Tekst niem.},
 type={czasopismo},
 title={Fossilium Catalogus. II, Plantae. Pars 6: K. Nagel, Juglandaceae},
 keywords={orzechowate, czasopisma, paleontologia, skamieliny},
}