@misc{Hertwig_Richard_(1850–1937)_Abstammungslehre_1927,
 author={Hertwig, Richard (1850–1937)},
 copyright={Public Domain},
 address={Jena},
 howpublished={online},
 year={1927},
 publisher={Verlag von Gustav Fischer},
 type={Text},
 title={Abstammungslehre und neuere Biologie},
 URL={http://rcin.org.pl./Content/69716/PDF/WA488_91133_2084_R.Hertwig.pdf},
 keywords={Darwinism, Evolution (biology)},
}