Dignen, Bob
English for meetings = Bahasa Inggris untuk rapat
York Associates, 1999
 Buku Teks SO
Dignen, Bob
Basic business English words = Perbendaharaan kata bahasa Inggris dasar untuk dunia bisnis
York Associates, 1999
 Buku Teks SO
Graver, B.D.
Advanced English practice
Oxford University Press, 1990
 Buku Teks SO
Jaderstrom, Susan
Business English at work
McGraw-Hill Glencoe, 2003
 Buku Teks SO
Jones, Leo
Eight simulation for upper-intermediate and more advanced students of English : controller's book / Leo Jones
Cambridge University Press, 1989
 Buku Teks SO