APA (7th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. (1981). National Geographic book of mammals. The Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. National Geographic Book of Mammals. Washington, D.C.: The Society, 1981.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. National Geographic Book of Mammals. The Society, 1981.