Christie, Francis
Oxford University Press, 1989
Buku Teks
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., author
Cambridge University Press, 1994
Buku Teks