https://digital.katalog.queersearch.org/s/katalog/item/43462, “Mystisches Denken, Geisteskrankheit und moderne Kunst”, https://digital.katalog.queersearch.org/s/katalog/item/49324, QueerSearch, accessed 30. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/26266