World Bank. Africa Regional Office. Office of the Chief Economist, World Bank. Africa Regional Office. Operational Quality and Knowledge Services, World Bank. Development Data Group, & ebrary, Inc. (2006). The little data book on Africa 2006. World Bank.
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Chicago Style (17th ed.) Zitazioa
World Bank. Africa Regional Office. Office of the Chief Economist, World Bank. Africa Regional Office. Operational Quality and Knowledge Services, World Bank. Development Data Group, eta Inc ebrary. The Little Data Book on Africa 2006. Washington, DC: World Bank, 2006.
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MLA (9th ed.) Zitazioa
World Bank. Africa Regional Office. Office of the Chief Economist, et al. The Little Data Book on Africa 2006. World Bank, 2006.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.