1. Bell, G.A., Cooper, M.A. and Jenkins, J.O. (1999) Software Cost Estimation: Where Next? In the Proceedings of the United Kingdom Academy for Information Systems (UKAIS ‘99), UK: York University, pp. 575–587.
2. Bell, G.A., Cooper, M., Warwick, J. and Kennedy, M. (2005) The Holon Framework: Process improvement and control for higher rducation. In: J. Groccia and J. Miller (eds.) On Becoming a Productive University: Strategies for Reducing Costs and Increasing Quality in Higher Education. USA: Anker Publishing.
3. Bell, G.A., Warwick, J., Cooper, M. and Kennedy, M. (2001) Towards a general holistic framework for improving and controlling human activity Systems. In: B. Lehaney, S. Clarke and M. Nicholls (eds.) Mixed Mode Modelling: Mixing Methodologies for Intervention. Utrecht, Netherlands: Klewer Academic Publisher.
4. Bell, G.A. and Warwick, J. (2007) Towards establishing the use of holons as an enquiry method. International Transactions in Operational Research 14 (1): 55–73.
5. Bell, G.A., Warwick, J. and Kennedy, M. (2008a) Social Theory and Philosophy for Software Project Management, In the Proceedings of the 50th Operational Research Conference, York University, UK.