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Dyfyniad Arddull ChicagoBusiness International Japan Roundtable. New York: Corporation Heaquarters, 1971.
Dyfyniad MLABusiness International Japan Roundtable. New York: Corporation Heaquarters, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.