Swan, Michael
The new Cambridge English course. Student 4, Upper-intermediate
Cambridge University Press, 1993
Buku Teks
Jones, Leo
Great ideas : teacher's manual ; listening and speaking activities for students of American English / Leo Jones and Victoria Kimbrough
Cambridge University Press, 1989
Buku Teks
King, Gareth
Colloquial english : a complete english language course
Routledge, 2005
Buku Teks
O`Neill, Robert
Kernel lessons intermediate students book / Robert O'Neill, Roy Kingsbury, and Tony Yeadon
Longman, 1990
Buku Teks
Low, Ona
Proficiency in english course
Edward Arnold, 1986
Buku Teks