APA (7th ed.) Citation

United States. National Park Service, Tolson, H. A., & Baker, H. W. (1972). National Park Service officials (Centennial ed.). The Service.

Chicago Style (17th ed.) Citation

United States. National Park Service, Hillory Alfred Tolson, and Howard W. Baker. National Park Service Officials. Centennial ed. [Washington]: The Service, 1972.

MLA (9th ed.) Citation

United States. National Park Service, et al. National Park Service Officials. Centennial ed. The Service, 1972.