Parent and Educator Resource Guide to Section 504 in Public Elementary and Secondary Schools
https://www2.ed.gov/about/offices/list/ocr/docs/504-resource-guide-201612.pdf
Section 504 FAQs
504 Plans and Your Child. A Guide for Parents.
https://www.understood.org/en/articles/504-plans-and-your-child-a-guide-for-families