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Dyfyniad Arddull ChicagoMishan, E. J. The Costs of Economic Growth. New York: Penguin Books, 1967.
Dyfyniad MLAMishan, E. J. The Costs of Economic Growth. New York: Penguin Books, 1967.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.