1. U.S. Department of Education, National Center for Education Statistics: Digest of Education Statistics, 2015 (2016-014), chap. 3 (2016). https://nces.ed.gov/fastfacts/display.asp?id=60
2. U.S. Department of Education, National Center for Education Statistics: Digest of Education Statistics, 2019 (2021-009), chap. 3 (2021). https://nces.ed.gov/fastfacts/display.asp?id=60
3. U.S. Department of Education, National Center for Education Statistics: Digest of Education Statistics, 2011 (2012-014), chap. 3 (2012)
4. Postsecondary National Policy Institute: Students with Disabilities in Higher Education (October 2021). https://pnpi.org/wp-content/uploads/2021/10/StudentswithDisabilities_October2021.pdf
5. U.S. Department of Education, Office for Civil Rights: Free Appropriate Public Education for Students With Disabilities: Requirements Under Section 504 of the Rehabilitation Act of 1973, Washington, D.C. (2010)