http://www.unicef.org/teachers/forum/0300.htm
http://www.britishcouncil.org/eltecs-publications-infodec03.pdf    (p.46)
http://www.nctd.org.uk/news/bobmarek-obe.asp

http://www.nctd.org.uk/MakingTG/index.asp
http://www.tactilevisioninc.com/educationaltools.html

http://www.tactilegraphics.org/designingtgs.html

http://www.icevi.org/publications/icevix/wshops/0088.html

http://www.nctd.org.uk