Dyfyniad APA

World Bank & ebrary, Inc. (2012). World development indicators: 2012. World Bank.

Dyfyniad Arddull Chicago

World Bank and Inc ebrary. World Development Indicators: 2012. Washington, D.C.: World Bank, 2012.

Dyfyniad MLA

World Bank and Inc ebrary. World Development Indicators: 2012. World Bank, 2012.

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