1. Levels of services delivery: an extension and an elaboration;Bender;Clinical Psychology Forum,1991
2. Fisher, R. , and Ury, W. (1983) Getting to Yes. London: Hutchinsons
3. Georgiades, N.J. , and Phillimore, L. (1975) The myth of the hero-innovator and alternative strategies for organizational change. In C. Kieman and F.P. Woodford (eds) Behaviour modification with the severely retarded. Amsterdam: Associated Scientific Publishers