https://digital.katalog.queersearch.org/s/katalog/item/65032, https://digital.katalog.queersearch.org/s/katalog/item/63858, and https://digital.katalog.queersearch.org/s/katalog/item/66744, “Biological Determinants of Sexual Orientation”, QueerSearch, accessed 28. April 2025, https://digital.katalog.queersearch.org/s/katalog/item/62010