https://digital.katalog.queersearch.org/s/katalog/item/43366 and https://digital.katalog.queersearch.org/s/katalog/item/43368, “Die Kameradschaftsehe”, https://digital.katalog.queersearch.org/s/katalog/item/45938, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/26103