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Dyfyniad Arddull ChicagoJha, Prabhat, and Frank J. Chaloupka. Curbing the Epidemic: Governments and the Economics of Tobacco Control. Washington, D.C: World Bank, 1999.
Dyfyniad MLAJha, Prabhat, and Frank J. Chaloupka. Curbing the Epidemic: Governments and the Economics of Tobacco Control. World Bank, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.