Low, Ona
Edward Arnold, 1986
Buku Teks
Stone, Linton
Macmillan, 1967
Buku Teks
Dieterich, Thomas G.
Center for Applied Linguistics, 1979
Buku Teks
Sewell, R.
Asian Educational Services, 1987
Buku Teks
by Sang-Oak Lee [and others]
[publisher not identified], [date of publication not identified]
Buku Teks