https://digital.katalog.queersearch.org/s/katalog/item/42963, “An Introduction to Sexual Physiology For Biological, Medical, and Agricultural Students: With Illustrations”, https://digital.katalog.queersearch.org/s/katalog/item/49327, QueerSearch, accessed 1. Mai 2025, https://digital.katalog.queersearch.org/s/katalog/item/25255