Laski, Harold J., author
George Allen and Unwin, 1935
Buku Teks
Vincent, Andrew
Basil Blackwell, 1987
Buku Teks
Kelsen, Hans, author
The Lawbook Exchange, 1993
Buku Teks
Ingram, Jefferson L., author
Pearson/Prentice Hall, 2005
Buku Teks
Harvard Business School Press, 1991
Buku Teks