Jain, Sarah S. Lochlann, author
Princeton University Press, 2006
Buku Teks
Shuman, Howard E.
Prentice-Hall, 1992
Buku Teks
Graber, Doris A., author
Congressional Quarterly Press, 1980
Buku Teks
Greenberg, Daniel S., author
The University of Chicago Press , 1999
Buku Teks
edited by Diana J. Mason, Judith K Leavitt, Mary W. Chaffeee
Elsevier Saunder, 2012
Buku Teks