The World Bank. (2006). Africa development indicators 2006. Washington, D.C: The World Bank.
Trích dẫn kiểu ChicagoThe World Bank. Africa Development Indicators 2006. Washington, D.C: The World Bank, 2006.
MLA citiranjeThe World Bank. Africa Development Indicators 2006. Washington, D.C: The World Bank, 2006.
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