Best Practices: Writing for Accessibility
http://www.joedolson.com/articles/2008/05/best-practices-writing-for-accessibility/

Dolson, Joe
Accessible Web Design
2008

Abstract:

Most of the time, the primary focus of information about accessibility has to do with making non-text information available as text. Captioning and audio description for video, transcriptions for audio, simple text alternatives for static images. But what about the content itself?