APA (7th ed.) Citation

Geological Survey (U.S.) & Sorey, M. L. (1996). Invisible CO₂ gas killing trees at Mammoth Mountain, California. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and M. L. Sorey. Invisible CO₂ Gas Killing Trees at Mammoth Mountain, California. [Menlo Park, Calif.]: U.S. Geological Survey, 1996.

MLA (9th ed.) Citation

Geological Survey (U.S.) and M. L. Sorey. Invisible CO₂ Gas Killing Trees at Mammoth Mountain, California. U.S. Geological Survey, 1996.