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
Longman, 1992
Buku Referensi
[publisher not identified], [date of publication not identified]
Buku Referensi