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Dyfyniad Arddull ChicagoGatell, Frank Otto, and Paul Weinstein Goodman. Growth of American Politics. New York: Oxford University, 1972.
Dyfyniad MLAGatell, Frank Otto, and Paul Weinstein Goodman. Growth of American Politics. Oxford University, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.