1. Ades, Y.M. et al, 1989, Namat User Manual, Doha, Qatar, (mainly in Arabic)
2. Andersen, P. Bogh. 1997, A Theory of Computer Semiotics, 2nd edition, Cambridge University Press
3. Ashby, W.R., 1956, An Introduction to Cybernetics, London, Chapman and Hall
4. Austin, J.L. 1962, How to Do Things with Words, Oxford, Oxford University Press.
5. Barwise, J and J.Perry, 1983, Situations and Attitudes, Cambridge Mass, MIT Press.