Todd, Paul
London Blackstone 1996.,
Buku Referensi
Heydon, J.D.
Butterworth, 1993
Buku Teks
Hudson, Alastair
Cavendish Publishing Limited, 2003
Buku Teks
Pettit, Philip H., editor
English Language Book Society , 1985
Buku Teks
Haley, Michael
Sweet and Maxwell, 2007
Buku Teks