https://digital.katalog.queersearch.org/s/katalog/item/43434, “Völker, Rassen, Sprachen: Anthropologische Betrachtungen”, https://digital.katalog.queersearch.org/s/katalog/item/48082, QueerSearch, accessed 17. Juni 2025, https://digital.katalog.queersearch.org/s/katalog/item/26230