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Freeman 2007, p. 94. Freeman, R. B. (2007). Charles Darwin: A companion (2nd online leid.). The Complete Works of Charles Darwin Online. pp. 107, 109. Suarchyvuota iš originalo 2014-12-25. Nuoroda tikrinta 2014-12-25.
Barta, Tony (2005-06-02). „Mr Darwin's shooters: on natural selection and the naturalizing of genocide“. Patterns of Prejudice. 39 (2): 116–137. doi:10.1080/00313220500106170. S2CID159807728.
Barta, Tony (2005-06-02). „Mr Darwin's shooters: on natural selection and the naturalizing of genocide“. Patterns of Prejudice. 39 (2): 116–137. doi:10.1080/00313220500106170. S2CID159807728.
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web.archive.org
Freeman 2007, p. 106 Freeman, R. B. (2007). Charles Darwin: A companion (2nd online leid.). The Complete Works of Charles Darwin Online. pp. 107, 109. Suarchyvuota iš originalo 2014-12-25. Nuoroda tikrinta 2014-12-25.
Sweet 2004 Sweet, William (2004). „Herbert Spencer“. Internet Encyclopedia of Philosophy. Suarchyvuota iš originalo 2010-05-28. Nuoroda tikrinta 2008-12-16.
Freeman 2007, p. 94. Freeman, R. B. (2007). Charles Darwin: A companion (2nd online leid.). The Complete Works of Charles Darwin Online. pp. 107, 109. Suarchyvuota iš originalo 2014-12-25. Nuoroda tikrinta 2014-12-25.
Heard, Stephen B. (2020-03-17). Charles Darwin's barnacle and David Bowie's spider : how scientific names celebrate adventurers, heroes, and even a few scoundrels. Damstra, Emily S. New Haven. ISBN978-0-300-25269-9. OCLC1143645266.{{cite book}}: CS1 priežiūra: location missing publisher (link)