Blume, William Wirt
Prentice-Hall, 1955
Buku Teks
Ides, Allan, author
Aspen Law & Business, 2003
Buku Teks
Louisell, David W., author
Foundation Press, 1979
Buku Teks
Karlen, Delmar
West, 1972
Buku Teks
Dickinson, Peter Somers.
W.S. Hein, 1989
Buku Teks