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Dyfyniad Arddull ChicagoHart,H. L. A. Law, Liberty and Morality. Stanford: Stanford university press, 1963.
Dyfyniad MLAHart,H. L. A. Law, Liberty and Morality. Stanford university press, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.