Hopkins, Diana, author
Cambridge University Press, 2011
Buku Teks
editor, Peter Salim
Modern English Press, 1990
Buku Referensi
Peter Salim, author
Modern English Press, 1993
Buku Referensi
Peter Salim, author
Modern English Press, [date of publication not identified]
Buku Referensi
Peter Salim, author
Modern English Press, 1989
Buku Referensi