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Dyfyniad Arddull ChicagoFriedman, Lawrence M. American Law in the 20th Century. New Haven: Yale University, 2002.
Dyfyniad MLAFriedman, Lawrence M. American Law in the 20th Century. Yale University, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.