APA (7th ed.) Citation

Kotok, E. S. (1971). Lodgepole pine: Pinus contorta Dougl (rev.). USDA Forest Service.

Chicago Style (17th ed.) Citation

Kotok, Edward S. Lodgepole Pine: Pinus Contorta Dougl. rev. Washington, D.C: USDA Forest Service, 1971.

MLA (9th ed.) Citation

Kotok, Edward S. Lodgepole Pine: Pinus Contorta Dougl. rev. USDA Forest Service, 1971.