Vermeer, Jan, and Lieven Devreese. “Birth Sex Ratio, Infant Mortality and Rearing Type in Captive Western Lowland Gorillas”. Journal of Zoo and Aquarium Research 3, no. 1 (January 31, 2015): 6–10. Accessed April 20, 2024. https://jzar.org/jzar/article/view/107.