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Dyfyniad Arddull ChicagoOrganisation for Economic Co-operation and Development. Germany: 1981. Paris: OECD Publishing, 1981.
Dyfyniad MLAOrganisation for Economic Co-operation and Development. Germany: 1981. OECD Publishing, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.