O`Neill, William L.
The progressive years : America comes of age
Harper & Row Publishers, 1975
 Buku Teks SO
Soros, George
The age of fallibility : the consequences of the war on terror
Public Affairs, 2006
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Shea, John C.
American government: the great game of politics
St. Martin's Press, 1984
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Cochran, Thomas C.
The Age of enterprise : a social history of industrial America
Macmillan, 1947
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Weaver, John D.
The Great experiment
Little, Brown, 1965
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