https://digital.katalog.queersearch.org/s/katalog/item/40747 and https://digital.katalog.queersearch.org/s/katalog/item/40339, “Before Stonewall: The Making of a Gay and Lesbian Community”, https://digital.katalog.queersearch.org/s/katalog/item/48457, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/16973