Cita APA (7a ed.)

Sheffield, J., & Wood, E. F. (2011). Drought: Past problems and future scenarios. Earthscan.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

Sheffield, Justin, y Eric F. Wood. Drought: Past Problems and Future Scenarios. Earthscan, 2011.