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Dyfyniad Arddull ChicagoHarvard Business Review. The HBR List: Breakthrough Ideas for 2009. Boston: Harvard Business, 2009.
Dyfyniad MLAHarvard Business Review. The HBR List: Breakthrough Ideas for 2009. Harvard Business, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.