1. Allmendinger, P. (2002) Planning theory. New York, NY: Palgrave.
2. Archer, M.S. (1998) Introduction: realism in the social sciences. In M.S. Archer et al. (eds.) Critical realism: essential readings. London: Routledge.
3. Baëhr, P. (1990) Review article: critical realism, cautionary realism. Sociological Review 38(4):765–778.
4. Bhaskar, R. (1978) A realist theory of science. Hassocks: Harvester Press.
5. Bhaskar, R. (1979) The possibility of naturalism: a philosophical critique of the contemporary human sciences. Brighton: Harvester Press.