APA (7th ed.) Citation

Kotok, E. S. (1973). Ponderosa pine. USDA Forest Service.

Chicago Style (17th ed.) Citation

Kotok, Edward S. Ponderosa Pine. Washington, D.C: USDA Forest Service, 1973.

MLA (9th ed.) Citation

Kotok, Edward S. Ponderosa Pine. USDA Forest Service, 1973.

Warning: These citations may not always be 100% accurate.