1. Bateson, G.: 1973, Steps to an Ecology of Mind, Paladin Frogsmore.
2. Berkeley, G.: 1975, Philosophical Works, Everyman Lib, London.
3. Chaitin, G.: 1999, The Unknowable, Springer, London.
4. Chaitin, G.: 2001, Exploring Randomnes, Springer London.
5. Damasio, A.R.: 1996, Descartes’ Error: Emotion, Reason, and the Human Brain, Papermac, New York.