https://digital.katalog.queersearch.org/s/katalog/item/44489, “Gay New York: Gender, Urban Culture and the Making of the Gay Male World, 1890-1940”, https://digital.katalog.queersearch.org/s/katalog/item/47520, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/28157