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Dyfyniad Arddull ChicagoJack, William. Principles of Health Economics for Developing Countries. Washington DC: World Bank, 1999.
Dyfyniad MLAJack, William. Principles of Health Economics for Developing Countries. Washington DC: World Bank, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.