Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 189, DOI:10.1016/j.shpsc.2008.03.002.
Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 190, DOI:10.1016/j.shpsc.2008.03.002.
Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 187, DOI:10.1016/j.shpsc.2008.03.002.
Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 191, DOI:10.1016/j.shpsc.2008.03.002.
Ellis, Havelock, My life, New, Spearman, 1967. URL consultato il 14 aprile 2013., p. 139
oadoi.org
Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 189, DOI:10.1016/j.shpsc.2008.03.002.
Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 190, DOI:10.1016/j.shpsc.2008.03.002.
Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 187, DOI:10.1016/j.shpsc.2008.03.002.
Ivan Crozier, Havelock Ellis, eugenicist, in Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences, Eugenics, sex and the state, vol. 39, n. 2, 1º giugno 2008, p. 191, DOI:10.1016/j.shpsc.2008.03.002.
web.archive.org
Ruth Pettis, Ellis, Havelock, su Glbtq.com. URL consultato l'11 giugno 2008 (archiviato dall'url originale il 27 marzo 2014).