https://digital.katalog.queersearch.org/s/katalog/item/40992, “Ein erfülltes Leben - trotzdem: Erinnerungen Homosexueller 1933-1945”, https://digital.katalog.queersearch.org/s/katalog/item/47507, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/17312