APA (7th ed.) Citation

Geological Survey (U.S.) & Ewert, J. W. (2006). The National Volcano Early Warning System (NVEWS). U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and John W. Ewert. The National Volcano Early Warning System (NVEWS). [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2006.

MLA (9th ed.) Citation

Geological Survey (U.S.) and John W. Ewert. The National Volcano Early Warning System (NVEWS). U.S. Dept. of the Interior, U.S. Geological Survey, 2006.