1. Videodisc evaluation report; “The Teddy Bears Disc”;Laurillard,1984
2. Discovering physics with microcomputers;Every;Comput. Educ.,1984
3. Every I. M., Graphics and animation in teaching dialogues. Open University CAL Research Group Technical Report No. 14 (1981).
4. LASERTEXT Reference Manual.;Butcher,1984
5. STAF2 Reference Manual.;Butcher,1982