https://digital.katalog.queersearch.org/s/katalog/item/63989 and https://digital.katalog.queersearch.org/s/katalog/item/63990, “Spain: the political and social context of sex reform in the late nineteenth and early twentieth centuries”, https://digital.katalog.queersearch.org/s/katalog/item/51011, QueerSearch, accessed 16. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/55988