Discover America! :
a scenic tour of the fifty states.
APA Citation
National Geographic Society (U.S.). (1989). Discover America!: a scenic tour of the fifty states. Washington, D.C.: National Geographic Society.
MLA Citation
National Geographic Society (U.S.). Discover America!: a Scenic Tour of the Fifty States. Washington, D.C.: National Geographic Society, 1989.
Warning: These citations may not always be complete (especially for serials).