Dolan, John F., author
Aspen Law & Business , 1997
Buku Teks
Dolan, John F., author
Little, Brown, 1991
Buku Teks
Goode, Roy, author
Penguin Books, 2004
Buku Teks
Savage, Nigel
Butterworth, 1991
Buku Teks
Hewiit, Charles M., author
Houghton Mifflin, 1962
Buku Teks