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Dyfyniad Arddull ChicagoChirot, Daniel. Social Change in the Twentieth Century. New york: Harcourt brace jovanovich, 1977.
Dyfyniad MLAChirot, Daniel. Social Change in the Twentieth Century. Harcourt brace jovanovich, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.