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Dyfyniad Arddull ChicagoGraff, J. Theoretical Welfare Economics. Cambridge: Univ. Press, 1963.
Dyfyniad MLAGraff, J. Theoretical Welfare Economics. Univ. Press, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.