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Dyfyniad Arddull ChicagoGreenstein, Fred I. The American Party System and the American People. Eanglewood cliffs: N J Prentice Hall, 1963.
Dyfyniad MLAGreenstein, Fred I. The American Party System and the American People. N J Prentice Hall, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.