APA (7th ed.) Citation

United States. National Park Service. (1940). Ecology of the Coyote in the Yellowstone. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Park Service. Ecology of the Coyote in the Yellowstone. [Washington]: [s.n.], 1940.

MLA (9th ed.) Citation

United States. National Park Service. Ecology of the Coyote in the Yellowstone. [s.n.], 1940.