Numrich, Carol
Raise the issues : an integrated approach to critical thinking
Longman, 1994
 Buku Teks
Richards, Jack C.
Key issues in language teaching
Cambridge University Press, 2015
 Buku Teks SO
Puchta, Herbert
English in mind : student's book 3
Cambridge University Press, 2010
 Buku Teks SO
Herrick, Christopher
Issues in American foreign policy
Longman, 2003
 Buku Teks SO
Pollock, Carroll Washington
Communicate what you mean : grammar for high level ESL students / Carroll Washington Pollock
Prentice-Hall, 1982
 Buku Teks SO