Osaka University
Osaka University, 2020
Buku Teks
edited by Albert H. Marckwardt
National Council of Teachers of English, 1968
Buku Teks
SEAMEO Regional Language Centre, 1983
Buku Referensi
Richards, Jack C.
Cambridge University Press, 2006
Buku Teks
Richards, Jack C.
Cambridge University Press, 1985
Buku Teks