Shuman, Howard E.
Prentice-Hall, 1992
Buku Teks
Graber, Doris A.
Congressional Quarterly Press, 1980
Buku Teks
Greenberg, Daniel S.
The University of Chicago Press , 1999
Buku Teks
edited by Diana J. Mason, Judith K Leavitt, Mary W. Chaffeee
Elsevier Saunder, 2012
Buku Teks
Dyer, Justin Buckley
Cambridge University Press, 2013
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