https://digital.katalog.queersearch.org/s/katalog/item/45286, “Defenders of the Race: Jewish Doctors and Race Science in Fin-de-Siècle Europe”, https://digital.katalog.queersearch.org/s/katalog/item/48477, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/30069