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Dyfyniad Arddull ChicagoOrganisation for Economic Co-operation and Development and ProQuest (Firm). Etudes Economiques De L'OCDE. Paris: OCDE, 2007.
Dyfyniad MLAOrganisation for Economic Co-operation and Development and ProQuest (Firm). Etudes Economiques De L'OCDE. OCDE, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.