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Dyfyniad Arddull ChicagoRoach, John Peter Charles. A Bibliography of Modern History. London: Cambridge University Press, 1968.
Dyfyniad MLARoach, John Peter Charles. A Bibliography of Modern History. Cambridge University Press, 1968.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.