1. Carrick FN, Setchell BP. The evolution of the scrotum. In: Calaby JH, Tyndale-Biscoe TH, editors. Reproduction and evolution. Canbera: Australian Academy of Science; 1977. p. 165–170.
2. Friderun Ankel-Simons. Primate anatomy: an introduction. Academic Press; 2010. ISBN 978–0–08–046911–9. Archived from the original on 26 March 2014. Retrieved 23 July 2013.
3. Alexander RD. Sexual dimorphism and breeding systems in pinnipeds, ungulates, primates, and humans. In: Chagnon NA, lrons W, Editors. Evolutionary biology and human social behavior, an anthropological perspective. Duxbury Press North Scituate, MA; 1979. p. 402–604.
4. Kenagy GJ, Stephen C. Trombulak, size and function of mammalian testes in relation to body size. J Mammal. 1986;67(1):1–22. https://doi.org/10.2307/1380997.
5. Vahed K, Carron G. Comparison of forced mating behaviour in four taxa of Anonconotus, the Alpine bushcricket. J Zool. 2008;276:313–21. https://doi.org/10.1111/j.1469-7998.2008.00492.x.