Cita APA (7a ed.)
El Wakeel, A., & Astatke, A. (1996). Intensification of agriculture on Vertisols to minimize land degradation in parts of the Ethiopian highlands. Wiley.
Cita Chicago Style (17a ed.)
El Wakeel, A., y A. Astatke. Intensification of Agriculture on Vertisols to Minimize Land Degradation in Parts of the Ethiopian Highlands. Wiley, 1996.
Cita MLA (9a ed.)
El Wakeel, A., y A. Astatke. Intensification of Agriculture on Vertisols to Minimize Land Degradation in Parts of the Ethiopian Highlands. Wiley, 1996.
Precaución: Estas citas no son 100% exactas.