https://digital.katalog.queersearch.org/s/katalog/item/44960, “Social Theories of the Press: Constituents of Communication Research, 1840s to 1920s”, https://digital.katalog.queersearch.org/s/katalog/item/48329, QueerSearch, accessed 20. Juni 2025, https://digital.katalog.queersearch.org/s/katalog/item/29284