1. Ackoff, R. L. (1974). The Systems Revolution.Long Range Plan. 7, 2?20.
2. Berkeley, G. (1710).The Principles of Human Knowledge, 1962 ed., Warnock, G. J. (ed.), Fontana Press, London.
3. Bhaskar, R. (1978).A Realist Theory of Science, 2nd ed., Harvester Press, Brighton.
4. Bhaskar, R. (1979).The Possibility of Naturalism, Harvester Press, Brighton.
5. Bhaskar, R. (1986).Scientific Realism and Human Emancipation, Verso, London.