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Dyfyniad Arddull ChicagoSimmons, Matthew R. Twilight in the Desert: The Coming Saudi Oil Shock and the World Economy. Hoboken, N.J.: John Wiley & Sons, 2005.
Dyfyniad MLASimmons, Matthew R. Twilight in the Desert: The Coming Saudi Oil Shock and the World Economy. John Wiley & Sons, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.