ProQuest (Firm). (2012). Main aggregates. OECD.
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Dyfyniad Arddull Chicago
ProQuest (Firm). Main Aggregates. [Paris]: OECD, 2012.
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Dyfyniad MLA
ProQuest (Firm). Main Aggregates. OECD, 2012.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.