https://digital.katalog.queersearch.org/s/katalog/item/44049, “Queer Lives across the Wall: Desire and Danger in Divided Berlin, 1945-1970”, https://digital.katalog.queersearch.org/s/katalog/item/49312, QueerSearch, accessed 1. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/27279