Herman, Susan N.
Oxford Univesity Press, 2011
Buku Teks SO
Ali Muhammad
The Phinisi Press, 2015
Buku Teks
Patterson, Thomas E.
McGraw-Hill, 203
Buku Teks SO
Duffy, Helen
Cambridge University Press, 2005
Buku Teks
Soros, George
Public Affairs, 2006
Buku Teks SO