APA (7th ed.) Citation

National Geographic Society (U.S.). (2004). In focus: National Geographic greatest portraits. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). In Focus: National Geographic Greatest Portraits. Washington, D.C: National Geographic Society, 2004.

MLA (8th ed.) Citation

National Geographic Society (U.S.). In Focus: National Geographic Greatest Portraits. National Geographic Society, 2004.

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