Barkin, J. Samuel, 1965-, author
Cambridge University Press, 2010
Buku Teks
Kegley, Charles W. (Charles William), Jr., author
St. Martin's Press, 1995
Buku Teks
Kegley, Charles W. (Charles William), Jr., author
St. Martin's Press , 1995
Buku Teks
Viotti, Paul R
Longman, 2012
Buku Teks
Olson, William Clinton, author
Prentice Hall International, 1994
Buku Teks