Perry, Martin
Chichester: John Wiley & Sons, c1997
Buku Teks
Chan, Helena H.M.
Butterworth, 1995
Buku Teks
Teo, Keang Sood, author
Butterworth, 1998
Buku Teks
Plavers, Anthony
Butterworth Asia, 1996
Buku Teks
Kala Anadarajah
Butterworth Asia, 1995
Buku Teks