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Dyfyniad Arddull ChicagoBrown,A J. Introduction to the World Economy. 3. New Delhi: S Chand & Company, 1969.
Dyfyniad MLABrown,A J. Introduction to the World Economy. 3. S Chand & Company, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.