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Dyfyniad Arddull ChicagoSpinner, Jr. A Political and Social History of Guyana. Boulder: Westview, 1984.
Dyfyniad MLASpinner, Jr. A Political and Social History of Guyana. Westview, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.