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.]: 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.