https://digital.katalog.queersearch.org/s/katalog/item/40453, “A Problem in Greek Ethics: Beeing: An Inquiry into the Phenomenon of Sexual Inversion: Addressed Especially to Medical Psychologists and Jurists”, https://digital.katalog.queersearch.org/s/katalog/item/48568, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/26819