Yang, W. (1965). Methods Of Farm Management Investigations For Improving Farm Productivity (Revised Edition.). FAO.
Chicago-referens (17:e uppl.)Yang, W.Y. Methods Of Farm Management Investigations For Improving Farm Productivity. Revised Edition. Rome: FAO, 1965.
MLA-referens (9:e uppl.)Yang, W.Y. Methods Of Farm Management Investigations For Improving Farm Productivity. Revised Edition. FAO, 1965.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.