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Dyfyniad Arddull ChicagoNoreng, Oystein. Oil Politics in the 1980s: Pattern of International Cooperation. New York: McGraw-Hill Book Company, 1978.
Dyfyniad MLANoreng, Oystein. Oil Politics in the 1980s: Pattern of International Cooperation. New York: McGraw-Hill Book Company, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.