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"About AZA". Association of Zoos and Aquariums. Archived from the original on August 25, 2010. Retrieved August 20, 2010.
"Zoo and Aquarium Statistics". Association of Zoos & Aquariums. January 8, 2020. Archived from the original on January 17, 2019. Retrieved January 17, 2019.
Grech, Kali S. (2004). "Overview of the Laws Affecting Zoos". Animal Legal & Historical Center. Michigan State University College of Law. Archived from the original on June 24, 2012. Retrieved August 11, 2010.
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Carlson, Peter (June 17, 1990). "AT THE ZOO". Washington Post. ISSN0190-8286. Archived from the original on June 14, 2021. Retrieved September 21, 2021.
Carlson, Peter (June 17, 1990). "AT THE ZOO". Washington Post. ISSN0190-8286. Archived from the original on June 14, 2021. Retrieved September 21, 2021.