https://digital.katalog.queersearch.org/s/katalog/item/39149 and https://digital.katalog.queersearch.org/s/katalog/item/40437, “Ja, unsere Kreise berühren sich: Briefe”, https://digital.katalog.queersearch.org/s/katalog/item/42601, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/26863