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2. IEEE Computer Society and ISO/IEC Joint Technical Committee. First Edition 1 December2011.Systems and Software Engineering – Life Cycle Processes – Requirements Engineering ISO/IEC/IEEE 29148:2011.
3. American Institute of Aeronautics and Astronautics January 22 1993 ANSI/AIAA G-043-1992 Guide for the Preparation of Operational Concept Documents Washington D.C.
4. Association for Project Management APM Body of Knowledge 6th edition (2013) – Definition of the word Stakeholder Ibis House Regent Park Bucks UK