1. World Health Organization (WHO): Disabilities, http://www.who.int/topics/disabilities/en .
2. Keates, S: Design for the Value of Inclusiveness. Handbook of ethics, values, and technological design. Springer Netherlands (2014).
3. World Health Organization (WHO): Visual impairments and blindness, http://www.who.int/mediacentre/factsheets/fs282/en/ .
4. World Health Organization (WHO): Deafness and hearing loss: http://www.who.int/mediacentre/factsheets/fs300/en/ .
5. SENADIS (Servicio Nacional de la Discapacidad), http://www.senadis.gob.cl .