Learn By Designs

http://Web Content Accessibility Guidelines (WCAG) 2.0

https://www.boia.org/blog/checklist-for-creating-accessible-videos

WebAIM: Web Accessibility In Mind

http://AEM Center: Vetting for Accessibility

https://www.washington.edu/accessibility/web/

https://edu.google.com/teacher-center

https://www.csun.edu/universal-design-center/digital-media-and-documents

https://www.rev.com/blog/resources/open-caption-vs-closed-caption-whats-the-difference

https://www.accessibilityassociation.org/s/

https://aem.cast.org/acquire/vetting-accessibility