https://digital.katalog.queersearch.org/s/katalog/item/44240, “Die Sexualberatungsstellen der Weimarer Republik 1919-1933”, https://digital.katalog.queersearch.org/s/katalog/item/49445, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/27712