https://digital.katalog.queersearch.org/s/katalog/item/52441, “The "Sissy Boy Syndrome" and the Development of Homosexuality”, https://digital.katalog.queersearch.org/s/katalog/item/48477, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/30228