1. ITGI. Board briefing on IT governance 2nd edition. IT Governance Institute (2003)
2. NGC. IT governance: Developing a successful governance strategy. National Computing Centre (2005)
3. ITGl. COBIT 4.1. IT Governance Institute (2007)
4. ISACA. COBIT 5: A business framework for the governance and management of enterprise IT. ISACA (2012).
5. OGC. ITIL service strategy version 3. Office of Government Commerce (2007)