ProQuest (Firm). (2011). PISA 2009 results: Students on line. OECD.
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Dyfyniad Arddull Chicago
ProQuest (Firm). PISA 2009 Results: Students on Line. [Paris]: OECD, 2011.
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Dyfyniad MLA
ProQuest (Firm). PISA 2009 Results: Students on Line. OECD, 2011.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.