DK Publishing, Inc. (2021). Behind the scenes at the zoo: Your all-access guide to the world's greatest zoos and aquariums (First American edition.). DK.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDK Publishing, Inc. Behind the Scenes at the Zoo: Your All-access Guide to the World's Greatest Zoos and Aquariums. First American edition. New York, NY: DK, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDK Publishing, Inc. Behind the Scenes at the Zoo: Your All-access Guide to the World's Greatest Zoos and Aquariums. First American edition. DK, 2021.
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