Moynihan, Cornelius J., author
West Publishing, 1962
Buku Teks
Burby, William Edward, 1893-, author
West Publishing, 1954
Buku Teks
Bergfield, Philip B., author
McGraw-Hill, c1979
Buku Teks
Kratovil, Robert, author
Prentice-Hall, 1974
Buku Teks
Lawson, F.H., author
Clarendon Press, 1958
Buku Teks