Browder, Olin L.
West Publishing Co, 1984
Buku Teks
Soderquist, Larry D.
Va. : Michie, c, 1991
Buku Teks
Lawson, F.H., author
Clarendon Press, 1958
Buku Teks
Moynihan, Cornelius J., author
West Publishing, 1962
Buku Teks
Kauper, Paul G., author
Little, Brown, 1971
Buku Teks