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Dyfyniad Arddull ChicagoHeydon, J. D. Cases and Materials on Evidence. London: Butterworths, 1975.
Dyfyniad MLAHeydon, J. D. Cases and Materials on Evidence. Butterworths, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.