1. Adamsons, I., and Taylor, H.R. (1990) Major causes of world blindness: Their treatment and prevention. Current Opinion in Ophthalmology, 1, 635–642.
2. Andrews, S.K. (1983) Spatial cognition through tactual maps. In J. Wiedel (Ed.), Proceedings of the 1st International Symposium on Maps and Graphics for the Visually Handicapped. Washington, DC: Association of American Geographers, pp. 30–40.
3. Braille Institute Newsletter, September 2002, http://www.brailleinstitute.org /Education-Statistics.html.
4. Goldsmith, S. (1983) The ideology ofdesigning for the disabled. In: Proceedings of the Fourteenth International Conference of the Environmental Design Research Association (EDRA 14). Lincoln, Nebraska, pp. 198–214.
5. Federal Transit Administration;K Hunter-Zaworski,1994