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Dyfyniad Arddull ChicagoThe World Bank. The Little Data Book 2009. Washington, D.C: The World Bank, 2009.
Dyfyniad MLAThe World Bank. The Little Data Book 2009. Washington, D.C: The World Bank, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.