AccessAbility 2: A Practical Handbook on Accessible Graphic Design
IBM Design and IBM Accessibility formed a partnership to help designers understand how physical and cognitive disabilities affect the use of a product, and help accessibility professionals understand creative elements that deliver better user experiences. https://www.ibm.com/devops/method/content/think/practice_inclusive_design/?platform=hootsuite
Think Brownstone's take on prioritizing accessibility in the design flow. http://www.thinkbrownstone.com/2016/03/myths-and-realities-of-designing-for-accessibility/
Been a few years since we overhauled our own site. Here it is, stripped down to the bare essentials while providing all the relevant information. Hope you like it.