https://digital.katalog.queersearch.org/s/katalog/item/64563 and https://digital.katalog.queersearch.org/s/katalog/item/65764, “Studentische Sexualität im Wandel: 1966 - 1981 - 1996 - 2012”, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/59861