https://digital.katalog.queersearch.org/s/katalog/item/43757, “Sex between Body and Mind: Psychoanalysis and Sexology in the German-speaking World, 1890s-1930s”, https://digital.katalog.queersearch.org/s/katalog/item/49191, QueerSearch, accessed 20. Juni 2025, https://digital.katalog.queersearch.org/s/katalog/item/26811