1. Goals and objectives for user interface software
2. Card, S. K., Moran, T . P. & Newell, A. (1983). The psychology of human-computer interaction. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc.
3. Edwards, A. D. N. (1987). Adapting user interfaces for visually disabled users. Unpublished doctoral thesis, Open University, Milton Keynes, UK.
4. Edwards, A. D. N. & Grove, P. (1988). A user'sguide to the Voice screen reader (Tech. Rep. No. 57). Milton Keynes, UK: Open University, Centre for Information Technology in Education.