Wittes, Benjamin.
Penguin Press, 2008.
Buku Teks
Ali Muhammad
The Phinisi Press, 2015
Buku Teks
Duffy, Helen
Cambridge University Press, 2005
Buku Teks
Duffy, Helen
Cambridge University Press, 2015
Buku Teks
Herman, Susan N.
Oxford Univesity Press, 2011
Buku Teks