S. Harper, und P. Green. International Conference on Computers Helping People with Special Needs, Seite 289--296. Germany, OCG Press, (Juli 2000)Under the auspices of the UNESCO.
P. Green, und S. Harper. International Conference on Computers Helping People with Special Needs, Seite 281--288. Germany, OCG Press, (Juli 2000)Under the auspices of the UNESCO.