APA (7th ed.) Citation

Cahill, J. M. (1984). Western hemlock. Forest Service, U.S. Dept. of Agriculture.

Chicago Style (17th ed.) Citation

Cahill, James M. Western Hemlock. [Washington, D.C.?]: Forest Service, U.S. Dept. of Agriculture, 1984.

MLA (9th ed.) Citation

Cahill, James M. Western Hemlock. Forest Service, U.S. Dept. of Agriculture, 1984.