Ruthenberg, H. (1976). Farming systems in the tropics (2. edition.). Oxford: Clarendon Press.
Citación estilo ChicagoRuthenberg, Hans. Farming Systems in the Tropics. 2. edition. Oxford: Clarendon Press, 1976.
Cita MLARuthenberg, Hans. Farming Systems in the Tropics. 2. edition. Oxford: Clarendon Press, 1976.
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