Paul Blenkhorn, "The RCEVH project on micro-computer systems and computer assisted learning", British Journal of Visual Impairment, 4/3, 101-103 (1986). Free HTML version at VisugateArquivado em 28 de setembro de 2007, no Wayback Machine..
Paul Blenkhorn, "The RCEVH project on micro-computer systems and computer assisted learning", British Journal of Visual Impairment, 4/3, 101-103 (1986). Free HTML version at VisugateArquivado em 28 de setembro de 2007, no Wayback Machine..