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Dyfyniad Arddull ChicagoFried, Edward R. Higher Oil Prices and the World Economic. Washington, D.C: Brookings Institutions, 1975.
Dyfyniad MLAFried, Edward R. Higher Oil Prices and the World Economic. Washington, D.C: Brookings Institutions, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.