https://digital.katalog.queersearch.org/s/katalog/item/42988, “Kinder: [Gewidmet "Margarete, meiner Freundin"]”, https://digital.katalog.queersearch.org/s/katalog/item/49247, QueerSearch, accessed 15. März 2025, https://digital.katalog.queersearch.org/s/katalog/item/25285