Singapura Intellectual Puclishing [t.th.]
Buku Referensi
Joint Publishing, 1985
Buku Referensi
Cheng, Yi-Li
[publisher not identified], [date of publication not identified]
Buku Referensi
Hornby, Albert Sydney
Oxford University Press, 1991
Buku Referensi
Macmillan, 2002
Buku Referensi