Hudson, Alastair, author
Cavendish Publishing Limited, 2003
Buku Teks
Stockwell, Nigel, author
Pitman, 1992
Buku Teks
Sydenham, Angela, author
Sweet & Maxwell, 2000
Buku Teks
Haley, Michael, author
Sweet and Maxwell, 2007
Buku Teks
Todd, Paul, author
London : Balckstone, 1994,
Buku Referensi