https://digital.katalog.queersearch.org/s/katalog/item/39828 and https://digital.katalog.queersearch.org/s/katalog/item/39829, “Freude am Sex. Joy of Sex.”, https://digital.katalog.queersearch.org/s/katalog/item/48294, QueerSearch, accessed 19. Juni 2025, https://digital.katalog.queersearch.org/s/katalog/item/5954