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Dyfyniad Arddull ChicagoEditors of Fortune. Markets of the Sixtties. New York: Harper & Brothers, 1960.
Dyfyniad MLAEditors of Fortune. Markets of the Sixtties. Harper & Brothers, 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.