GillJ. (2000). Which button? Designing user interfaces for people with visual impairments.London: Royal National Institute for the Blind.
2.
Technical Committee 224. (2000). Market, environment, and objectives of CEN/TC 224—Machine-readable cards, related device interfaces and operations [Html]. Comite Europeen de Normalisation. Available: http://www.cenorm.be
3.
WhittakerS. G., & CummingsR. W. (1999). New approaches for vision rehabilitation. In BergerJ. W., FineS. L., & MaguireM. G. (Eds.), Age-related macular degeneration (pp. 443–450). Philadelphia: Mosby.