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Dyfyniad Arddull ChicagoWorld Bank and World Bank. Where Is the Wealth of Nations: Measuring Capital for the 21st Century. Washington, D.C.: The World Bank, 2006.
Dyfyniad MLAWorld Bank and World Bank. Where Is the Wealth of Nations: Measuring Capital for the 21st Century. The World Bank, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.