Ruthenberg, H. (1976). Farming systems in the tropics (2. edition.). Oxford: Clarendon Press.
Chicago Style CitationRuthenberg, Hans. Farming Systems in the Tropics. 2. edition. Oxford: Clarendon Press, 1976.
MLA CitationRuthenberg, Hans. Farming Systems in the Tropics. 2. edition. Oxford: Clarendon Press, 1976.
Warning: These citations may not always be 100% accurate.