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Dyfyniad Arddull ChicagoWood, Merle V. Data Processing in Marketing. New York: Gregg Division/McGraw-Hill, 1971.
Dyfyniad MLAWood, Merle V. Data Processing in Marketing. Gregg Division/McGraw-Hill, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.