https://digital.katalog.queersearch.org/s/katalog/item/39278 and https://digital.katalog.queersearch.org/s/katalog/item/39279, “Nachuntersuchung von 85 operierten Transsexuellen”, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/59162