Ides, Allan, author
Aspen Law & Business, 2003
Buku Teks
Hart, James, author
Appleton-Century-Crofts, 1950
Buku Teks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Teks
Kauper, Paul G., author
Little, Brown, 1971
Buku Teks
Hamilton, Robert W.
St. Paul, Minn, 1989
Buku Teks