APA (7th ed.) Citation

United States. National Park Service, Story, I. F., & Yard, R. S. (1931). National parks portfolio. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. National Park Service, Isabelle F. Story, and Robert Sterling Yard. National Parks Portfolio. Washington: U.S. GPO, 1931.

MLA (9th ed.) Citation

United States. National Park Service, et al. National Parks Portfolio. U.S. GPO, 1931.