United Nations Development Programme & World Bank. (2006). ًWorld Development Indicators 2006. United Nations Development Programme ; World Bank.
Lua i Stíl Chicago (17ú heag.)United Nations Development Programme agus World Bank. ًWorld Development Indicators 2006. New York, N.Y. : Washington, D.C.: United Nations Development Programme ; World Bank, 2006.
Lua MLA (9ú heag.)United Nations Development Programme agus World Bank. ًWorld Development Indicators 2006. United Nations Development Programme ; World Bank, 2006.
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