- Accessibility for Everyone - This is the best book to start with. Not too heavy but thorough, it will give you a strong foundation.
- A Web for Everyone - Accessibility is UX. This book introduces accessibility from a UX view.
- Form Design Patterns - The forms are the core elements of the interactive web. Everybody wants to build better and more accessible ones; with this practical book, you can make them too.
- Inclusive Design Patterns - A practical book about how to build an inclusive front-end with various patterns.
- Inclusive Components - Similar to the Inclusive Design Patterns book but focuses more on components from the same author.
- Practical Web Inclusion and Accessibility: A Comprehensive Guide to Access Needs - A practical book approaching accessibility from per disability. An excellent second book.
- Resilient Web Design - It is not necessarily about accessibility but certainly about inclusivity.