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Dyfyniad Arddull ChicagoOrganisation for Economic Co-operation and Development, Programme for International Student Assessment, and ProQuest (Firm). PISA 2006 Technical Report. Paris: OECD, 2009.
Dyfyniad MLAOrganisation for Economic Co-operation and Development, et al. PISA 2006 Technical Report. OECD, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.