1. The Humane Society of the United States. 2012. USDA Inspection Report Quotes: Examples of Severe Violations. http://www.humanesociety.org/assets/pdfs/pets/puppy_mills/usda_severe_violations_pm.pdf
2. Association of Zoos and Aquariums. 2017. “About Us.” Accessed 6 October. https://www.aza.org/about-us
3. 3. Interacting with Animals
4. World Association of Zoos and Aquariums. 2005. Building a Future for Wildlife: The World Zoo and Aquarium Conservation Strategy. Berne, Switzerland. http://www.waza.org/files/webcontent/1.public_site/5.conservation/conservation_strategies/building_a_future_for_wildlife/wzacs-en.pdf
5. The Humane Society of the United States. 2016. Puppy Mills: Facts and Figures. http://www.humanesociety.org/assets/pdfs/pets/puppy_mills/puppy-mills-facts-and-figures.pdf