Moore, John A.
The pursuit of happiness: goverment and politics in America / John A. Moore and Myron Roberts
Macmillan Publishing Company, 1985
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Griffith, Ernest S.
The America system of goverment
London Methuen & Co. 1967,
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International Encyclopedia of goverment and politics
"S.Chand ,
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Points of view : readings in American goverment and politics
edited by Robert E. DiClerico, Allan S. Hammock
McGraw-Hill, 1992
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Rustow, Dankwart A.
the Politics of compromise : a study of parties and cabinet goverment in Sweden
Princeton University Press, 1955
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