1. Barth, F. (1993) Are values real? The enigma of naturalism in the anthropological imputation of values, in: M. Hechter, L. Nadel, & R. E. Michod (Eds) The Origin of Values, pp. 31–46(New York: Aldine de Gruyter).
2. Brooks, M. P. (2002) Planning Theory for Practitioners (London/New York: Routledge).
3. Planning: an idea of value
4. Planning to Change the World
5. Acting on Principle: Dilemmas in Planning Practice