Cita APA

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

Citación estilo Chicago

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

Cita MLA

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