https://digital.katalog.queersearch.org/s/katalog/item/45336 and https://digital.katalog.queersearch.org/s/katalog/item/45350, “Die hygienische Forderung”, https://digital.katalog.queersearch.org/s/katalog/item/49718, QueerSearch, accessed 15. März 2025, https://digital.katalog.queersearch.org/s/katalog/item/30196