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Dyfyniad Arddull ChicagoSeitz, Wesley D. Economics of Resources, Agriculture and Food. New York: McGraw-Hill, 1994.
Dyfyniad MLASeitz, Wesley D. Economics of Resources, Agriculture and Food. New York: McGraw-Hill, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.