1. Adtob. (n.d.). Chimpanzee—United States. Adtob. Retrieved from: https://www.adtob.com/sales/0/all/chimpanzee/1;%20https://www.exoticanimalsforsale.net/chimpanzee-for-sale.asp
2. Altevogt, B. M., Pankevich, D. E., Shelton-Davenport, M. K., & Kahn, J. P. (Eds.). (2011). Chimpanzees in biomedical and behavioral research: Assessing the necessity. Washington, DC: National Academies Press.
3. Animal Legal and Historical Center. (n.d.). Great ape laws by state. Animal Legal and Historical Center. Retrieved from: https://www.animallaw.info/site/great-ape-laws-state
4. Birkett, L. P., & Newton-Fisher, N. E. (2011). How abnormal is the behaviour of captive, zoo-living chimpanzees? PLoS ONE, 6(6), e20101.
5. Bonobo Conservation Initiative. (n.d.) Threats. Bonobo Conservation Initiative. Retrieved from: https://www.bonobo.org/bonobos/threats#:~:text=Bonobos%20are%