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Dyfyniad Arddull ChicagoPISA 2003: Technical Report. Paris: Organisation for Economic Co-operation and Development (OECD), 2005.
Dyfyniad MLAPISA 2003: Technical Report. Paris: Organisation for Economic Co-operation and Development (OECD), 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.