Yang, W. (1965). Methods Of Farm Management Investigations For Improving Farm Productivity (Revised Edition.). FAO.
Tohutoru Kātū Chicago (17th ed.)Yang, W.Y. Methods Of Farm Management Investigations For Improving Farm Productivity. Revised Edition. Rome: FAO, 1965.
Tohutoro MLA (9th ed.)Yang, W.Y. Methods Of Farm Management Investigations For Improving Farm Productivity. Revised Edition. FAO, 1965.
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