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Dyfyniad Arddull ChicagoJones, Walter S. The Logic of International Relations. 7th ed. New York, NY: HarperCollins Publishers, 1991.
Dyfyniad MLAJones, Walter S. The Logic of International Relations. 7th ed. HarperCollins Publishers, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.