APA (7th ed.) Citation

United States. Forest Service. Southwestern Region. (1990). The Focus. U.S. Dept. of Agriculture.

Chicago Style (17th ed.) Citation

United States. Forest Service. Southwestern Region. The Focus. [Washington, D.C.?]: U.S. Dept. of Agriculture, 1990.

MLA (9th ed.) Citation

United States. Forest Service. Southwestern Region. The Focus. U.S. Dept. of Agriculture, 1990.