Sellen, Derek
Skills in action : english language techniques for the JMB test and other academic purposes
Hulton Educational Publications, 1982
 Buku Teks
Smith, J. Mike
A study skills handbook
Oxford University Press, 1990
 Buku Teks
Research perspectives on english for academic purposes
John Flowerdew, Matthew Peacock
Cambridge University Press, 2001
 Buku Teks
Callow, Margaret
Heinemann integrated skills elementary / Margaret Callow
Heinemann Educational Books, 1990
 Buku Teks
Building English skills yellow level / prepared by Staff of the Writing Improvement Project
Illinois McDougal, 1977
 Buku Teks