APA (7th ed.) Citation

United States. National Park Service. (1972). The National Park Service management system. [U.S. Department of the Interior, National Park Service].

Chicago Style (17th ed.) Citation

United States. National Park Service. The National Park Service Management System. [Washington, D.C.]: [U.S. Department of the Interior, National Park Service], 1972.

MLA (9th ed.) Citation

United States. National Park Service. The National Park Service Management System. [U.S. Department of the Interior, National Park Service], 1972.