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Dyfyniad Arddull ChicagoZweifel,Peter, and Breyer,Friedrich. Health Economics. New York: Oxford University Press, 1997.
Dyfyniad MLAZweifel,Peter, and Breyer,Friedrich. Health Economics. Oxford University Press, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.