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Dyfyniad Arddull ChicagoSmith, Geoff. Wealth Creation: The Added Value Concept. London: Institute of Practitioners in Work study, Organisation and Methods, 1978.
Dyfyniad MLASmith, Geoff. Wealth Creation: The Added Value Concept. London: Institute of Practitioners in Work study, Organisation and Methods, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.