Farming Systems and Soil Resources Institute. (1993). Training manual on farming methods: Research methodology. Farming Systems and Soil Resources Institute, College of Agriculture, University of the Philippines at Los Baños.
Citace podle Chicago (17th ed.)Farming Systems and Soil Resources Institute. Training Manual on Farming Methods: Research Methodology. Los Baños: Farming Systems and Soil Resources Institute, College of Agriculture, University of the Philippines at Los Baños, 1993.
Citace podle MLA (9th ed.)Farming Systems and Soil Resources Institute. Training Manual on Farming Methods: Research Methodology. Farming Systems and Soil Resources Institute, College of Agriculture, University of the Philippines at Los Baños, 1993.
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