https://digital.katalog.queersearch.org/s/katalog/item/40020, “Das Wunder von Madrid: Aufsätze, Reden, Kritiken 1936-1938”, https://digital.katalog.queersearch.org/s/katalog/item/47507, QueerSearch, accessed 29. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/16578