https://digital.katalog.queersearch.org/s/katalog/item/38989, “Nirgendwo daheim : Das bewegte Leben des Bruno Vogel”, https://digital.katalog.queersearch.org/s/katalog/item/48360, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/35268