https://digital.katalog.queersearch.org/s/katalog/item/45071 and https://digital.katalog.queersearch.org/s/katalog/item/45072, “Das unerhörte Schweigen der Schwulen”, https://digital.katalog.queersearch.org/s/katalog/item/40631, QueerSearch, accessed 30. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/29591