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Dyfyniad Arddull ChicagoBerndt, Ernst R., Susan H. Busch, and Richard G. Frank. Price Indexes for Acute Phase Treatment of Depression. Cambridge: National Bureau of Economic Research, 1998.
Dyfyniad MLABerndt, Ernst R., et al. Price Indexes for Acute Phase Treatment of Depression. National Bureau of Economic Research, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.