Bradbrook, Adrian J., author
The Law Book Company Limited, 1991
Buku Teks
Shenkel, William M., author
McGraw-Hill , 1978
Buku Teks
Bernhardt, Roger, author
West Publishing, 1993
Buku Teks
Kratovil, Robert, author
Prentice-Hall, 1974
Buku Teks
Bergfield, Philip B., author
McGraw-Hill, c1979
Buku Teks