Godwin, R. J. (1990). Agricultural engineering in development: Tillage for crop production in areas of low rainfall. Food and Agriculture Organization of the United Nations.
Chicago-referens (17:e uppl.)Godwin, R. J. Agricultural Engineering in Development: Tillage for Crop Production in Areas of Low Rainfall. Rome: Food and Agriculture Organization of the United Nations, 1990.
MLA-referens (9:e uppl.)Godwin, R. J. Agricultural Engineering in Development: Tillage for Crop Production in Areas of Low Rainfall. Food and Agriculture Organization of the United Nations, 1990.
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