Introductions online

• A comprehensive collection of articles (English): https://webaim.org

More in-depth books

• Accessibility For Everyone – Laura Kalbag (English): https://abookapart.com/products/accessibility-for-everyone
• A Web for Everyone – Sarah Horton and Whitney Quesenbery (English): http://rosenfeldmedia.com/books/a-web-for-everyone

Useful reading for developers

• Accessibility Developer Guide for HTML with tips for an optimal development setup and many examples (English): https://www.accessibility-developer-guide.com
• BBC Guide for iOS, Android and HTML (English): http://www.bbc.co.uk/guidelines/futuremedia/accessibility/mobile
• iOS Accessibility Documentation (English): https://developer.apple.com/accessibility/ios
• Android Accessibility Documentation (English): https://developer.android.com/guide/topics/ui/accessibility

Accessibility reviews

• Accessibility Review How-To (accessible with SBB Login)

Documents for certification

• Web Content Accessibility Guidelines on which both certification and the legal foundations are based (English): https://www.w3.org/TR/WCAG21
• Complete checklist for certifications based on the WCAG: http://www.accessibility-checklist.ch
• Advice from the Access For All foundation: https://access-for-all.ch/leistungen/beratung/

Important inspiration for this guide

• http://accessibility.voxmedia.com
• https://moritzgiessmann.de/accessibility-cheatsheet