Cita APA (7a ed.)
Scherr, S. J. (1999). Soil degradation: A threat to developing-country food security by 2020? International Food Policy Research Institute.
Cita Chicago Style (17a ed.)
Scherr, Sara J. Soil Degradation: A Threat to Developing-country Food Security by 2020? International Food Policy Research Institute, 1999.
Cita MLA (9a ed.)
Scherr, Sara J. Soil Degradation: A Threat to Developing-country Food Security by 2020? International Food Policy Research Institute, 1999.
Precaución: Estas citas no son 100% exactas.