APA (7th ed.) Citation

United States. Forest Service. (1993). Mount Zirkel wilderness area. [U.S. Dept. of Agriculture, Forest Service?].

Chicago Style (17th ed.) Citation

United States. Forest Service. Mount Zirkel Wilderness Area. [Denver, Colo.?]: [U.S. Dept. of Agriculture, Forest Service?], 1993.

MLA (9th ed.) Citation

United States. Forest Service. Mount Zirkel Wilderness Area. [U.S. Dept. of Agriculture, Forest Service?], 1993.