@misc{Darwin_Charles_Robert_(1809–1882)_The_[po,
 author={Darwin, Charles Robert (1809–1882)},
 copyright={Public Domain},
 address={Akron (Ohio)},
 journal={International Science Library},
 howpublished={online},
 year={[po 1872]},
 publisher={The Werner Company},
 language={eng},
 title={The origin of species by means of natural selection : or, the preservation of favored races in the struggle for life. Vol. 1},
 type={Text},
 URL={http://www.rcin.org.pl/Content/138495/PDF/WA488_173584_201249-1_The-origin-of-specie.pdf},
 keywords={Evolution, Natural history, Origin of species - natural selection - favored races struggle for existence - instinct},
}