Cita APA

Sheffield, J., & Wood, E. F. (2011). Drought: Past problems and future scenarios. London ; Washington, D.C.: Earthscan.

Citación estilo Chicago

Sheffield, Justin., and Eric F. Wood. Drought: Past Problems and Future Scenarios. London ; Washington, D.C.: Earthscan, 2011.

Cita MLA

Sheffield, Justin., and Eric F. Wood. Drought: Past Problems and Future Scenarios. London ; Washington, D.C.: Earthscan, 2011.