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Dyfyniad Arddull ChicagoOrganisation for Economic Co-operation and Development. OECD Economic Surveys. Paris: OECD, 1969.
Dyfyniad MLAOrganisation for Economic Co-operation and Development. OECD Economic Surveys. OECD, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.