@misc{Jennings_Herbert_Spencer_(1868–1947)_Genetic_1935,
 author={Jennings, Herbert Spencer (1868–1947)},
 copyright={Public Domain},
 address={Princeton},
 howpublished={online},
 year={1935},
 publisher={Princeton University Press},
 language={eng},
 title={Genetic variations in relation to evolution : a critical inquiry into the observed types of inherited variation, in relation to evolutionary change},
 type={Text},
 URL={http://rcin.org.pl/Content/117997/PDF/WA488_xxxxxx_243_Jennings-Genetic-Variations.pdf},
 keywords={Genetic variability - evolutionary changes - book, Unicellular organisms - gene mutations - book},
}