APA (7th ed.) Citation

United States. National Park Service. (1938). Rope, knots, and climbing. [s.n.].

Chicago Style (17th ed.) Citation

United States. National Park Service. Rope, Knots, and Climbing. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. National Park Service. Rope, Knots, and Climbing. [s.n.], 1938.