Heller, T., Rizzolo, M. K. and Caldwell., J. (2005) “Mental Retardation in America: A Historical Reader”., Disability Studies Quarterly, 25(2). Available at: https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/dsq/article/view/568 (Accessed: 5 May 2026).