https://digital.katalog.queersearch.org/s/katalog/item/40603, “Ein homophober Kriegsgeneral: Karl v. Einem (1853 bis 1934)”, https://digital.katalog.queersearch.org/s/katalog/item/42696, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/55490