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Dyfyniad Arddull ChicagoOrakhelashvili, Alexander. Peremptory Norms in International Law. Oxford: Oxford University Press, 2006.
Dyfyniad MLAOrakhelashvili, Alexander. Peremptory Norms in International Law. Oxford University Press, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.