https://digital.katalog.queersearch.org/s/katalog/item/40549 and https://digital.katalog.queersearch.org/s/katalog/item/40550, “Homosexualität”, https://digital.katalog.queersearch.org/s/katalog/item/47731, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/16691