The Unicode Consortium.
The Unicode Standard
Reading, Mass.: Addison-Wesley, 2003, as updated from time to time by the publication
of new versions.
See
http://www.unicode.org/standard/versions/
for the latest version and additional information on versions of the standard and
of the Unicode Character Database.
The version of Unicode to be used is
implementation-defined,
but implementations are recommended to use the latest Unicode version.