APA (7th ed.) Citation

National Geographic Society (U.S.). Book Division. (1997). Exploring America's historic places. The National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Book Division. Exploring America's Historic Places. Washington, D.C: The National Geographic Society, 1997.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Book Division. Exploring America's Historic Places. The National Geographic Society, 1997.