@misc{_Ernst,
 copyright={Public Domain},
 howpublished={online},
 type={Image},
 title={Ernst Haeckel [?]},
 URL={http://rcin.org.pl./Content/211643/PDF/WA058_248044_Haeckel_Ernest.pdf},
 keywords={Haeckel, Ernst (1834-1919), biologists, travelers, explorators, philosophers},
}