APA (7th ed.) Citation

Ferrell, G. T. (1986). Fir engraver ([Rev. Sept. 1986].). U.S. Dept. of Agriculture, Forest Service.

Chicago Style (17th ed.) Citation

Ferrell, George T. Fir Engraver. [Rev. Sept. 1986]. [Washington, D.C.?]: U.S. Dept. of Agriculture, Forest Service, 1986.

MLA (9th ed.) Citation

Ferrell, George T. Fir Engraver. [Rev. Sept. 1986]. U.S. Dept. of Agriculture, Forest Service, 1986.