APA (7th ed.) Citation

Roche, L. R., & Fowler, D. P. (1975). Genetics of Sitka spruce. U.S. Forest Service.

Chicago Style (17th ed.) Citation

Roche, L. R., and D. P. Fowler. Genetics of Sitka Spruce. [Washington, D.C.]: U.S. Forest Service, 1975.

MLA (9th ed.) Citation

Roche, L. R., and D. P. Fowler. Genetics of Sitka Spruce. U.S. Forest Service, 1975.