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Dyfyniad Arddull ChicagoStiglitz, Joseph E. Principles of Macroeconomics. New York: W.W. Norton & Company, 1997.
Dyfyniad MLAStiglitz, Joseph E. Principles of Macroeconomics. New York: W.W. Norton & Company, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.