Cita APA (7a ed.)

Sheets, P. D., & Grayson, D. K. (1979). Volcanic activity and human ecology. Academic Press.

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

Sheets, Payson D., y Donald K. Grayson. Volcanic Activity and Human Ecology. Academic Press, 1979.