APA (7th ed.) Citation

Bull, E. L., & Henjum, M. G. (1990). Ecology of the great gray owl. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station.

Chicago Style (17th ed.) Citation

Bull, Evelyn L., and Mark G. Henjum. Ecology of the Great Gray Owl. Portland, Or. (319 S.W. Pine St., P.O. Box 3890, Portland 97208): U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1990.

MLA (9th ed.) Citation

Bull, Evelyn L., and Mark G. Henjum. Ecology of the Great Gray Owl. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1990.