Cita APA (7a ed.)
Drechsel, P., & Penning de Vries, F. W. (2001). Land pressure and soil nutrient depletion in Sub-Saharan Africa.
Cita Chicago Style (17a ed.)
Drechsel, Pay, y Frits W.T Penning de Vries. Land Pressure and Soil Nutrient Depletion in Sub-Saharan Africa. 2001.
Cita MLA (9a ed.)
Drechsel, Pay, y Frits W.T Penning de Vries. Land Pressure and Soil Nutrient Depletion in Sub-Saharan Africa. 2001.
Precaución: Estas citas no son 100% exactas.