APA (7th ed.) Citation

Campbell, R. K., & Sugano, A. I. (1993). Genetic variation and seed zones of douglas-fir in the Siskiyou National Forest. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station.

Chicago Style (17th ed.) Citation

Campbell, Robert Kenneth, and Albert I. Sugano. Genetic Variation and Seed Zones of Douglas-fir in the Siskiyou National Forest. Portland, Or. (333 S.W. First Ave., P.O. Box 3890, Portland 97208): U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1993.

MLA (9th ed.) Citation

Campbell, Robert Kenneth, and Albert I. Sugano. Genetic Variation and Seed Zones of Douglas-fir in the Siskiyou National Forest. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1993.