Potter, Pitman B., author
University Of Washington Press, 1992
Buku Teks
Jhong, Jianhu
Sweet and Maxwell Asia, 1998
Buku Teks
Elliot, Catherine, author
Longman , 2001
Buku Teks
McKendrick, Ewan, author
Macmillan, 1994
Buku Teks
Higgins, P. F. P.
Butterworth, 1974
Buku Teks