Voiles, Price R.
Business English essentials / Price R. Voiles
Glencoe, 1993
 Buku Teks
Tomasowa, Francien Herlen
English for non-english departements
Universitas Brawijaya , 2005
 Buku Teks
Scobie, Janet I.
English for the certificate
George Allen and Unwin, 1959
 Buku Teks
Doff, Adrian
English Unlimited
Cambridge University Press, 2011
 Multimedia
Doff, Adrian
English Unlimited
Cambridge University Press, 2011
 Multimedia