Joyce, Helen de Silva, author
Phoenix Education, 2000
Buku Teks
Jordan, R. R., author
Longman, 2001
Buku Teks
Jordan, R. R.
Collins ELT, 1980
Buku Teks
Lee, Jae Sung., author
Delnyok, 2009
Buku Teks
Lee, Yang Hye, author
Language Plus, 2009
Buku Teks