English for specific purposes : law
disusun oleh Sofia Rangkuti-Hasibuan ; editor, Nung Atasana
Gramedia Pustaka Utama, 1992
 Buku Teks SO
Doff, Adrian
English unlimited : elementary e-portfolio DVD-ROM
Cambridge University Press, 2010
 Multimedia
English this way : teacher's manual and key to books 7-12
Macmillan, 1965
 Buku Teks SO
Doff, Adrian
English unlimited : advanced e-portfolio DVD-ROM
Cambridge University Press, 2010
 Multimedia
Doff, Adrian
English unlimited : elementary teacher's DVD-ROM
Cambridge University Press, 2010
 Multimedia