1. DirectGov: What are special educational needs?,
http://www.direct.gov.uk/en/Parents/Schoolslearninganddevelopment/SpecialEducationalNeeds/DG_4008600
2. ISO (International Organization for Standardization): ISO 9241-171:2008 Ergonomics of human-system interaction – Part 171: Guidance on software accessibility (2008)
3. W3C: Web Content Accessibility Guidelines (WCAG) 2.0,
http://www.w3.org/TR/WCAG20
4. Poon-McBrayer, K.F., Lian, M.G.J.: Special needs education: children with exceptionalities. Chinese University Press (2002)
5. Lacerda, G.: Hércules y Jiló. Un Software Educativo para la Estimulación Matemática, Lingüística y Social de Niños con Deficiencia Mentas. Revista de Informática Educativa, 32–47 (February 2000)