https://digital.katalog.queersearch.org/s/katalog/item/44669 and https://digital.katalog.queersearch.org/s/katalog/item/50076, “Wörterbuch der Sexuologie und ihrer Grenzgebiete”, https://digital.katalog.queersearch.org/s/katalog/item/50544, QueerSearch, accessed 3. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/28523