APA (7th ed.) Citation

National Geographic Society (U.S.). (1989). Discover America!: A scenic tour of the fifty states. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Discover America!: A Scenic Tour of the Fifty States. Washington, D.C: National Geographic Society, 1989.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Discover America!: A Scenic Tour of the Fifty States. National Geographic Society, 1989.