Hansen, Don R., author
South-Western College Publishing, 2000
Buku Teks
Norgaard, Corine T., author
Prentice-Hall, 1985
Buku Teks
Khan, M.Y., author
McGraw-Hill, 1985
Buku Teks
Enthoven, R.E.
The Clarendon Press, 1924
Buku Teks
The Hague Kluer Law International , 1995
Buku Teks