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Dyfyniad Arddull ChicagoHealy, David. Modern Imperialism: Changing Styles in Historical Interpretation. Washington, D.C: Service Center for Teachers of History, 1967.
Dyfyniad MLAHealy, David. Modern Imperialism: Changing Styles in Historical Interpretation. Service Center for Teachers of History, 1967.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.