Tomasowa, Francien Herlen
English for management
Universitas Brawijaya, 2005
 Buku Teks SO
Eastwood, John
English for travel
Oxford University Press, 1994
 Buku Teks SO
Scobie, Janet I.
English for the certificate
George Allen and Unwin, 1959
 Buku Teks SO
Doff, Adrian
English Unlimited
Cambridge University Press, 2011
 Multimedia
Doff, Adrian
English Unlimited
Cambridge University Press, 2011
 Multimedia