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Dyfyniad Arddull ChicagoConverse, Paul D. The Elements of Marketing. New York: Prentice-Hall, Inc, 1946.
Dyfyniad MLAConverse, Paul D. The Elements of Marketing. New York: Prentice-Hall, Inc, 1946.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.