APA (7th ed.) Citation

United States. Forest Service. Rocky Mountain Region, Washburn, F. E., & Good, L. S. (1938). Arapaho National Forest, Colorado. The Service.

Chicago Style (17th ed.) Citation

United States. Forest Service. Rocky Mountain Region, F. E. Washburn, and L. S. Good. Arapaho National Forest, Colorado. [Washington, D.C.]: The Service, 1938.

MLA (9th ed.) Citation

United States. Forest Service. Rocky Mountain Region, et al. Arapaho National Forest, Colorado. The Service, 1938.