1. International Organization for Standardization (2006). ISO 9241-20 Ergonomics of human-system interaction (20): Accessibility guidelines for information/communication technology (ICT) equipment and services. International Organization for Standardization (2006). ISO 9241-20 Ergonomics of human-system interaction (20): Accessibility guidelines for information/communication technology (ICT) equipment and services.
2. WHO World Health Organization https://www.who.int/disabilities/world_report/2011/report/en/ WHO World Health Organization https://www.who.int/disabilities/world_report/2011/report/en/
3. WHO World Health Organization https://www.who.int/news-room/fact-sheets/detail/ageing-and-health WHO World Health Organization https://www.who.int/news-room/fact-sheets/detail/ageing-and-health
4. Toward accessibility with usability
5. Accessibility Devices for Mobile Interfaces Extensions