APA (7th ed.) Citation

United States. National Park Service, Yard, R. S., & Story, I. F. (1928). The national parks portfolio (5th ed.). U.S. Govt. Print. Off.

Chicago Style (17th ed.) Citation

United States. National Park Service, Robert Sterling Yard, and Isabelle F. Story. The National Parks Portfolio. 5th ed. Washington: U.S. Govt. Print. Off, 1928.

MLA (9th ed.) Citation

United States. National Park Service, et al. The National Parks Portfolio. 5th ed. U.S. Govt. Print. Off, 1928.