1. Accenture (2004). eGovernment leadership: high performance, maximum value, May.
2. ADAE (2003). Le Cadre Commun d'Intéroperabilité version 2.1.
3. The European Union and its eGovernment development policy;Alabau;Fundación Vodafone,2004
4. Enterprise architecture for egovernment;Bellman,2004
5. CEC, Commission of the European Communities. (1991). Council Directive 91/250/EEC of 14 May 1991 on the legal protection of computer programs.