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Dyfyniad Arddull ChicagoSeperich, George J., Michael W. Woolverton, and James G. Beierlein. Introduction to Agribusiness Marketing. Englewood Cliffs, NJ: Regents/Prentice Hall, 1994.
Dyfyniad MLASeperich, George J., et al. Introduction to Agribusiness Marketing. Regents/Prentice Hall, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.