https://digital.katalog.queersearch.org/s/katalog/item/43666, “Contraception (Birth Control): Its Theory, History and Practice: A Manual for the Medical and Legal Professions”, https://digital.katalog.queersearch.org/s/katalog/item/49907, QueerSearch, accessed 2. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/26650