1. Ackerman, R. J.: 1972, Belief and Knowledge, Doubleday and Company, Garden City, New York.
2. Arlow, J. A. and Brenner, C.: 1964, Psychoanalytic Concepts and the Structural Theory, International Universities Press, New York.
3. Brody, B. A.: 1980, Identity and Essence, Princeton University Press, Princeton, New Jersey.
4. Danto, A.: 1963, ‘What we can do’, Journal of Philosophy 60, 435–445.
5. Danto, A.: 1965, ‘Basic actions’, American Philosophical Quarterly 2, 141–148.