Points of view : readings in American government and politics
Robert E. Diclerico, Allan S. Hammock, editor
McGraw-Hill, 2009
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Bailey, Stephen K.
America politics and goverment
Voice of America Forum Lectures, 1956
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International Encyclopedia of goverment and politics
"S.Chand ,
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O`Connor, Robert E.
Politics and structure: essentials of American national goverment / Robert E. O'Connor, Thomas G. Ingersoll
Brooks/Cole, 1979
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Ferguson, John H.
The American federal goverment
McGraw-Hill, 1961
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