Emalia Iragiliati Sukarni
Episodes in Indonesian : a pre-intermediate proficiency practice / by Emalia Iragiliati Sukarni
Gramedia Pustaka Utama, 2000
 Buku Teks SO
Alexander, L.G.
Fluency in English : an integrated course for advanced students
Longman, 1967
 Buku Teks SO
Alexander, L.G.
Developing skills : an integrated course for intermediate students
Longman, 1964
 Buku Teks SO
Cotton, David
Market Leader: pre-intermediate
Pearson Education Limited, 2012
 Multimedia
Cunningham, Sarah
Everyday listening and speaking pre-intermediate
Oxford University Press , 1994
 Buku Teks SO