1. W3C, World Wide Web Consortium. (2008). Web content accessibility guidelines (WCAG), version 2.0. Retrieved from https://www.w3.org/Translations/WCAG20-pt-PT
2. W3C, World Wide Web Consortium. (2016). Web Accessibility Evaluation Tools List. Retrieved from https://www.w3.org/WAI/ER/tools
3. W3C, World Wide Web Consortium. (2018). Web Content Accessibility Guidelines (WCAG) 2.1. Retrieved from https://www.w3.org/TR/WCAG21/
4. Evaluating Web Accessibility of Educational Websites
5. NV Access. (n.d.). About NVDA. Retrieved from https://www.nvaccess.org/