Sueur, AP.Le
Covendish Publishing Limited, 1995
Buku Teks
Thompson, Brian, editor
Balckstone Press Limited, s.a.
Buku Teks
De Smith, S.A. [Stanley A.]
Penguin Education, 1973
Buku Teks
Phillips, O. Hood
Sweet & Maxwell, 2001
Buku Teks
Carroll, Alex, 1947-
Pearson Longman, 2007
Buku Teks