Yeric, Jerry L.
Public opinion : the visible politics / Jerry L. Yeric, John R. Todd
F.E. Peacock Publishers, 1983
 Buku Teks
Roll, Charles W.
Polls, their use and misuse in politics / Charles W. Roll, Jr. & Albert H. Cantril
Seven Locks Press, 1980
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Burlingame, Roger
The American conscience
Alfred A. Knopf, 1960
 Buku Teks SO
American capitalism : social thought and political economy in the twetieth century
edited by Nelson Lichtenstein
University of Pennsylvania press, 2006
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Braeman, John
American politics in the twentieth century
Thomas Y. Crowill, 1969
 Buku Teks