Simmonds, N. W. (1985). Farming systems research. Washington, D.C: The World Bank.
Trích dẫn kiểu ChicagoSimmonds, Norman W. Farming Systems Research. Washington, D.C: The World Bank, 1985.
Deismireacht MLASimmonds, Norman W. Farming Systems Research. Washington, D.C: The World Bank, 1985.
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