World Bank & ebrary, Inc. (2009). World Development Indicators. World Bank Publications.
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Dyfyniad Arddull Chicago
World Bank and Inc ebrary. World Development Indicators. Washington: World Bank Publications, 2009.
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Dyfyniad MLA
World Bank and Inc ebrary. World Development Indicators. World Bank Publications, 2009.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.