APA (7th ed.) Citation

National Geographic Society (U.S.). (1991). National Geographic picture atlas of our world. The National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). National Geographic Picture Atlas of Our World. Washington D.C: The National Geographic Society, 1991.

MLA (9th ed.) Citation

National Geographic Society (U.S.). National Geographic Picture Atlas of Our World. The National Geographic Society, 1991.