John Flowerdew, Matthew Peacock
Cambridge University Press, 2001
Buku Teks
Pattison, Tania, author
Pearson , 2015
Buku Teks
Grace Josephine Tiwon Wiradisastra, author
UI-Press, 2006
Buku Teks
Sellen, Derek
Hulton Educational Publications, 1982
Buku Teks
Swales, John M., author
Cambridge University Press , 1990
Buku Teks