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Dyfyniad Arddull ChicagoYoungson,A.J. British Economy 1920-1957. London: Unwin University Press, 1964.
Dyfyniad MLAYoungson,A.J. British Economy 1920-1957. Unwin University Press, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.