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