Lamb, George P.
Little,Brown and Company, 1971
Buku Teks
Aust, Anthony, author
Cambridge University Press, 2000
Buku Teks
Addison, Neil, author
Blackstone Press Limited, 1998
Buku Teks
Foskett, David, author
Thomson Reuters, 2010
Buku Teks
Mohammad Naqib Ishan Jan, author
Lexis Nexis, 2010
Buku Teks