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Dyfyniad Arddull ChicagoGennard, John. Economic and Technologicl Environments 3. England: Open University Press, 1976.
Dyfyniad MLAGennard, John. Economic and Technologicl Environments 3. Open University Press, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.