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Dyfyniad Arddull ChicagoLowery, David. Organized Interests and American Government. New York: McGraw-Hill, 2004.
Dyfyniad MLALowery, David. Organized Interests and American Government. New York: McGraw-Hill, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.