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3. ISO: International Organization for Standardization’s ISO 9241-171 Ergonomics of human-system interaction – Guidance on software accessibility (2012). https://www.iso.org/obp/ui/#iso:std:iso:9241:-171:ed-1:v1:en
4. World Wide Web Consortium: Accessibility. W3C Recommendation (2005). https://www.w3.org/standards/webdesign/accessibility
5. World Wide Web Consortium: Web Accessibility Initiative (2005). https://www.w3.org/WAI/gettingstarted/