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Dyfyniad Arddull ChicagoRoll, Eric. A History of Economic Thought. 3rd.ed. New Jersey: Prentice-Hall, 1953.
Dyfyniad MLARoll, Eric. A History of Economic Thought. 3rd.ed. Prentice-Hall, 1953.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.