1. Beer S., 1990, The Heart of Enterprise, John Wiley and Sons, Chichester.
2. Castle J.A., 1995, The Development of an integrating methodology for Strategic and Operations Management., The Proceedings of the British Academy of Management Annual Conference, Sheffield University, pp 454.
3. Checkland P.B., 1981, Systems Thinking Systems Practice, Wiley, Chichester.
4. Checkland P.B., and Casar A., 1986, Vickers’ concept of an appreciative system: A systemic account. Journal of Applied Systems Analysis, vol. 13: 4–17.
5. Checkland P.B., and Scholes J., 1990, Soft Systems Methodology in Action, Wiley, Chichester.