Ditzenberger, R., & Kidney, J. (1981). Selling: Helping customers buy. South-Western Pub. Co..
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Dyfyniad Arddull Chicago
Ditzenberger, Roger, and John Kidney. Selling: Helping Customers Buy. Cincinnati: South-Western Pub. Co., 1981.
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Dyfyniad MLA
Ditzenberger, Roger, and John Kidney. Selling: Helping Customers Buy. South-Western Pub. Co., 1981.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.