Terry, Morgan
Focus on academic skills for IELTS
Pearson, 2007
 Buku Teks
Hopkins, Diane
Cambridge grammar for IELTS.
Cambridge University Press, 2006
 Multimedia
Boyd, Elaine
Objective IELTS.
Cambridge University Press, 2006
 Multimedia
Boyd, Elaine
Objective IELTS.
Cambridge University Press, 2006
 Multimedia
Agustina Any Purwanti
Struktur dan fungsi kalimat minor
1989
 UI - Skripsi (Membership)