Adams, Kristen David, author
St. Paul, MN : West Group, 2010
Buku Teks
Miller, Roger LeRoy, author
Thomson West, 2007
Buku Teks
Macintryre, Ewan, author
Blackstone Press, 1998
Buku Referensi
Stephenson, Graham, author
Blakstone Press, 1995
Buku Teks
Montgomerie, John
Butterworth, 1950
Buku Teks