APA (7th ed.) Citation

National Geographic Society U.S. (1982). Our violent earth. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society U.S. Our Violent Earth. Washington, D.C.: National Geographic Society, 1982.

MLA (9th ed.) Citation

National Geographic Society U.S. Our Violent Earth. National Geographic Society, 1982.

Warning: These citations may not always be 100% accurate.