APA (7th ed.) Citation

National Geographic Society (U.S.), Oak Ridge National Laboratory, & Whitmore, D. (2011). The world of seven billion. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.), Oak Ridge National Laboratory, and David Whitmore. The World of Seven Billion. Washington, D.C.: National Geographic Society, 2011.

MLA (9th ed.) Citation

National Geographic Society (U.S.), et al. The World of Seven Billion. National Geographic Society, 2011.