https://digital.katalog.queersearch.org/s/katalog/item/47459, “Magnus Hirschfelds Exil-Gästebuch 1933–1935.”, https://digital.katalog.queersearch.org/s/katalog/item/47588, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/5724