edited by Bernard Berelson
Voice of America, 1975
Buku Teks
edited by Quentin H. Stanford
Oxford University Press, 1972
Buku Teks
Russett, Bruce, author
Wadsworth, 2010
Buku Teks
Kegley, Charles W. (Charles William), Jr., author
Wadsworth, 2009
Buku Teks
Rourke, John T., author
McGraw-Hill, 2010
Buku Teks