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Dyfyniad Arddull ChicagoOshaughnessy, J. Evaluate Your Sales Force. London: British Institute of Management, 1971.
Dyfyniad MLAOshaughnessy, J. Evaluate Your Sales Force. British Institute of Management, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.