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Dyfyniad Arddull ChicagoRich,E E, and Wilson,C H. The Cambridge Economic History of Europe. Cambridge: Cambridge University Press, 1977.
Dyfyniad MLARich,E E, and Wilson,C H. The Cambridge Economic History of Europe. Cambridge University Press, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.