@misc{Haeckel_Ernest_(1834–1919)_Kunstformen_[c.,
 author={Haeckel, Ernest (1834–1919)},
 copyright={Public Domain},
 address={Leipzig},
 howpublished={online},
 year={[c. a. 1924]},
 publisher={Bibliographisches Institut},
 language={pol},
 title={Kunstformen der Natur},
 type={Image},
 keywords={Zoology - pictorial works, Botany - pictorial works},
}