Thomson, A.J.
A practical English grammar
Oxford Oxford University Press, 1986
 Buku Teks SO
Lugton, Robert C.
American topics: a reading-vocabulary text for speakers of English as a second language / Robert C. Lugton
Prentice-Hall, 1978
 Buku Teks SO
Steinberg, Roberta
Prentice-hall's practice test for the TOEFL : four complete sample test, including essay writing sections
Prentice-Hall, 1987
 Buku Teks SO
Cambridge IELTS 3 : examination papers from University of Cambridge ESOL examinations
Cambridge University Press, 2007
 Multimedia
Cambridge IELTS 3 : examination papers from University of Cambridge ESOL examinations
Cambridge University Press, 2007
 Multimedia