Adams, Kristen David, author
St. Paul, MN : West Group, 2010
Buku Teks
Macintryre, Ewan, author
Blackstone Press, 1998
Buku Referensi
Stephenson, Graham, author
Blakstone Press, 1995
Buku Teks
Braucher, Robert, author
Foundation Press, 1958
Buku Teks
West Publishing Company, 1996
Buku Teks