Postema, Gerald J., author
Clarendon Press, 1986
Buku Teks
Llewellyn, Karl N., author
Little, Brown and Company, 1960
Buku Teks
Llewellyn, Karl N., author
Little,Brown and Company, 1960
Buku Teks
Holmes, Oliver Wendell, Jr.
Little, Brown and Company, 1951
Buku Teks
Lyons, David, author
Clarendon Press, 1991
Buku Teks