↑ "εὐγενής". Greek Word Study Tool. Medford, Massachusetts: Tufts University. 2009. Dicapai 19 October 2017. Database includes entries from A Greek–English Lexicon and other English dictionaries of Ancient Greek.
↑ "γένος". Greek Word Study Tool. 2009. Dicapai 19 October 2017.
↑ "Eugenics". Unified Medical Language System (Psychological Index Terms). Bethesda, Maryland: National Library of Medicine. 2009. Diarkibkan daripada asal pada 16 October 2010. Dicapai 19 October 2017.
↑ "Eugenics". Stanford Encyclopedia of Philosophy. Center for the Study of Language and Information, Stanford University. 2 July 2014. Dicapai 2 January 2015.
↑ Lynn 2001. The Ethical Principles of Classical Eugenics – Conclusions P. 241 Quote: "A number of the opponents of eugenics have resorted to the slippery slope argument, which states that although a number of eugenic measures are unobjectionable in themselves, they could lead to further measures that would be unethical. This argument is unpersuasive because all sorts of measures that are acceptable might, if taken to extremes, lead to other measures that are unacceptable."
↑ Black, Edwin (2003). War Against the Weak: Eugenics and America's Campaign to Create a Master Race. Four Walls Eight Windows. ISBN1-56858-258-7.