1. Office of Government Commerce: ITIL Service Strategy. The Stationary Office, UK (2007)
2. Office of Government Commerce: ITIL Continual Service Improvement. The Stationary Office, UK (2007)
3. OGC: ITIL Service Support. The Stationary Office, UK (2002)
4. Cabinet Office: ITIL Service Strategy. The Stationary Office, UK (2011)
5. COBIT 4.1: Control Objectives for Information and related Technology: COBIT 4.1. IT Governance Institute (2007)