1. Bohr N. (1958). Atomic physics and human knowledge. Wiley, New York
2. Churchland P. (1984). Matter and consciousness. MIT Press, Cambridge, MNA
3. Galileo, G. (1623) [1957]. The assayer. In G. Stillman Drake (Trans), Discoveries and opinions of Galileo. New York: Doubleday.
4. Gibson J.J. (1964). The senses considered as perceptual systems. Allen and Unwin, London
5. Locke, J. (1690) [1974]. An essay concerning human understanding. London: Dent.