APA (7th ed.) Citation

United States. Forest Service. Southwestern Region. (1990). Wilderness ranger's guide. U.S. Dept. of Agriculture.

Chicago Style (17th ed.) Citation

United States. Forest Service. Southwestern Region. Wilderness Ranger's Guide. [Washington, D.C.?]: U.S. Dept. of Agriculture, 1990.

MLA (9th ed.) Citation

United States. Forest Service. Southwestern Region. Wilderness Ranger's Guide. U.S. Dept. of Agriculture, 1990.