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Dyfyniad Arddull ChicagoWhitehouse, Edward. Pensions Panorama: Retirement-income Systems in 53 Countries. Washington, D.C.: World Bank, 2007.
Dyfyniad MLAWhitehouse, Edward. Pensions Panorama: Retirement-income Systems in 53 Countries. World Bank, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.