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Dyfyniad Arddull ChicagoReview, HARVARD Business. Control Part Iii Harvard Business Review. HBR, 1974.
Dyfyniad MLAReview, HARVARD Business. Control Part Iii Harvard Business Review. HBR, 1974.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.