1. Checkland, P. [1981], Systems Thinking, Systems Practice, Wiley
2. Checkland, P., and Scholes, J. [1990], Soft Systems Methodology in Action, Wiley
3. Hammond, K.R., and Brehmer, B. [1973], Quasi rationality and distrust: implications for international conflict, in L. Rappoport and D.A. Summers, Eds, Human Judgment and Social Interaction, Holt Rhinehart and Winston, 337-391.
4. Hammond, K.R. [1976], Externalizing the parameters of quasi rational thought, in M Zeleny, Ed., Multiple Criteria Decision Making, Springer Verlag, 75-96
5. Hammond, K. R., Cook, R. L., and Adelman, L. [1977], POLICY: An aid for decision making and international communication, Columbia Journal of World Business, Fall, 79-91