Cita APA

Sheets, P. D., & Grayson, D. K. (1979). Volcanic activity and human ecology. New York: Academic Prees;.

Citación estilo Chicago

Sheets, Payson D., y Donald K. Grayson. Volcanic Activity and Human Ecology. New York: Academic Prees;, 1979.

Cita MLA

Sheets, Payson D., y Donald K. Grayson. Volcanic Activity and Human Ecology. New York: Academic Prees;, 1979.