https://digital.katalog.queersearch.org/s/katalog/item/39037, “Psychopathia sexualis: A medico-forensic study with Introduction by Victor Robinson”, https://digital.katalog.queersearch.org/s/katalog/item/49572, QueerSearch, accessed 15. März 2025, https://digital.katalog.queersearch.org/s/katalog/item/25776