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.
Chicago-referens (17:e uppl.)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.
MLA-referens (9:e uppl.)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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