References: Books
- 1. Zoo: A behind the scenes look at the animals and the people who care for them. (1988, Don Gold)
- 2. Zoo animals, people, places. (1974, Bernard. Livingston)
- 3. Zoological parks and aquariums in America: A directory. (1993, )
- 4. Zoos of the world (1967, Fisher, J.)

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