1. Adams, R. N.: 1975, Energy and Structure: A Theory of Social Power, University of Texas Press, Austin.
2. Alexander, R. D.: 1987, Biology of Moral Systems, de Gruyter, New York.
3. Åqvist, L.: 1987, Introduction to Deontic Logic and the Theory of Normative Systems, Bibliopolis, Naples.
4. Axelord, R.:1984 The Evolution of Cooperation, Basic Books, New York.
5. Bateson, G.: 1966, ‘Information, Codification, and Metacommunication’, in A. G. Smith (ed.), Communication and Culture, Holt, Rinehart and Winston, New York, pp. 412–426.