https://digital.katalog.queersearch.org/s/katalog/item/39716, “Sexualität: Störungen, Abweichungen, Transsexualität.”, https://digital.katalog.queersearch.org/s/katalog/item/48010, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/5844