https://digital.katalog.queersearch.org/s/katalog/item/39056, “Sex in Human Relationships: Translated by John Rodker with an introduction by Norman Haire”, https://digital.katalog.queersearch.org/s/katalog/item/50105, QueerSearch, accessed 7. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/29513