APA (7th ed.) Citation

Volcano Hazards Program (U.S.). Volcano Hazards Program. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Volcano Hazards Program (U.S.). Volcano Hazards Program. [Menlo Park, Calif.?]: U.S. Geological Survey.

MLA (9th ed.) Citation

Volcano Hazards Program (U.S.). Volcano Hazards Program. U.S. Geological Survey.

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