1. European Commission, Eurostat, Database. Prevalence of disability (source EHSIS). Population by sex, age and disability status (hlth-dpeh005). Available from: http://appsso.eurostat.ec.europa.eu/nui/show.do?dataset=hlth_dpeh040&lang=en.
2. Seybert H, Reinecke P. Three quarters of Europeans used the internet in 2013. Statistics in focus 29/2013. Available from: http://ec.europa.eu/eurostat/statistics-explained/index.php/Archive:Internet_use_statistics_-_individuals.
3. European Commission. Eurostat Database. Internet–level of access, use and activities (isoc_ci_in). Individuals–internet use (isoc_ci_ifp_iu). Available from: http://appsso.eurostat.ec.europa.eu/nui/show.do?dataset=isoc_ci_ifp_iu&lang=en.
4. Americans living with disability and their technology profile;S Fox,2011
5. U.S. Department of Commerce. Falling through the net: toward digital inclusion. A report on Americans’ Access to Technology Tools. October 2000. Available from: https://www.ntia.doc.gov/files/ntia/publications/fttn00.pdf.