https://digital.katalog.queersearch.org/s/katalog/item/44773, “The Sexual Perversions and Abnormalities: A Study in the Psychology of Paraphilia”, https://digital.katalog.queersearch.org/s/katalog/item/49088, QueerSearch, accessed 15. März 2025, https://digital.katalog.queersearch.org/s/katalog/item/28900