APA (7th ed.) Citation

United States. National Park Service. (1979). National park system and related areas as of June 30, 1979: Index. National Park Service.

Chicago Style (17th ed.) Citation

United States. National Park Service. National Park System and Related Areas as of June 30, 1979: Index. Washington, D.C.: National Park Service, 1979.

MLA (9th ed.) Citation

United States. National Park Service. National Park System and Related Areas as of June 30, 1979: Index. National Park Service, 1979.