APA (7th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. (1990). Hidden worlds of wildlife. The Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. Hidden Worlds of Wildlife. Washington, D.C.: The Society, 1990.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Special Publications Division. Hidden Worlds of Wildlife. The Society, 1990.