1. Adams, J. (1996) Risk, London: University College Press.
2. Arrow, K. (1963) Social Choice and Individual Values, London: Yale University Press.
3. Barnes, B. and Bloor, D. (1982) Relativism, Rationalism and the Sociology of Knowledge in W. Hollis and S. Lukes (eds) Rationality and Relativism, pp. 21-47, Oxford: Blackwell.
4. Beck, U. (1992) Risk Society, London.
5. Bogetoft, P. and Pruzan, P. (1991) Planning with Multiple Criteria: Investigation, Communication, Choice, Amsterdam: North Holland.