APA (7th ed.) Citation

Thro, E. (1992). Volcanoes of the United States. F. Watts.

Chicago Style (17th ed.) Citation

Thro, Ellen. Volcanoes of the United States. New York: F. Watts, 1992.

MLA (9th ed.) Citation

Thro, Ellen. Volcanoes of the United States. F. Watts, 1992.