Here is a link to a youtube video of potty training suggestions:
7 Tips to Help Potty-Training Your Child with Special Needs
https://www.youtube.com/watch?v=IqYjcbOtM44
In this video, she also recommends the book: "The Potty Journey" by Judith A. Coucouvanis
I have purchased this book for the loaning library. Check with me to see if it is available :)