World Bank & ebrary, Inc. (2012). World development indicators: 2012. World Bank.
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Chicago-čujuhus (17. p.)
World Bank juo Inc ebrary. World Development Indicators: 2012. Washington, D.C.: World Bank, 2012.
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MLA-čujuhus (9. p.)
World Bank juo Inc ebrary. World Development Indicators: 2012. World Bank, 2012.
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