https://digital.katalog.queersearch.org/s/katalog/item/63965, “Helene Stöcker. Verkünderin und Verwirklicherin”, https://digital.katalog.queersearch.org/s/katalog/item/47858, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/55942