Drummond, H. E., & Goodwin, J. W. (2014). Agricultural economics (3rd ed.). Prentice Hall.
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Dyfyniad Arddull Chicago
Drummond, H. Evan, and John W. Goodwin. Agricultural Economics. 3rd ed. Upper Saddle River, NJ: Prentice Hall, 2014.
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Dyfyniad MLA
Drummond, H. Evan, and John W. Goodwin. Agricultural Economics. 3rd ed. Prentice Hall, 2014.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.