APA (7th ed.) Citation

Foxworthy, B. L., & Hill, M. (1982). Volcanic eruptions of 1980 at Mount St. Helens: The first 100 days. U.S. G.P.O..

Chicago Style (17th ed.) Citation

Foxworthy, B. L., and Mary Hill. Volcanic Eruptions of 1980 at Mount St. Helens: The First 100 Days. Washington: U.S. G.P.O., 1982.

MLA (8th ed.) Citation

Foxworthy, B. L., and Mary Hill. Volcanic Eruptions of 1980 at Mount St. Helens: The First 100 Days. U.S. G.P.O., 1982.

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