Dignen, Bob
English for presentations = Bahasa Inggris untuk presentasi / Bob Dignen
York Associates, 1999
 Buku Teks
English for specific purposes : law
disusun oleh Sofia Rangkuti-Hasibuan ; editor, Nung Atasana
Gramedia Pustaka Utama, 1992
 Buku Teks
English this way : teacher's manual and key to books 7-12
Macmillan, 1965
 Buku Teks
Axtell, Roger E.
Dos and taboos of using English around the world / Roger E. Axtell
John Wiley & Sons, 1995
 Buku Teks
Hutchinson, Tom, 1930-
English for specific purposes : a learning-centred approach / Tom Hutchinson and Alan Waters
Cambridge University Press , 1993
 Buku Teks