APA (7th ed.) Citation

Ewert, J. W., Diefenbach, A. K., & Ramsey, D. W. (2018). 2018 update to the U.S. Geological Survey national volcanic threat assessment. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Ewert, John W., Angela K. Diefenbach, and David W. Ramsey. 2018 Update to the U.S. Geological Survey National Volcanic Threat Assessment. Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2018.

MLA (9th ed.) Citation

Ewert, John W., et al. 2018 Update to the U.S. Geological Survey National Volcanic Threat Assessment. U.S. Department of the Interior, U.S. Geological Survey, 2018.