Dr. Abdullah Abubakr. “The Effects of the Color Wheel System on Reducing Inappropriate Behaviors in Students With Autism Spectrum Disorder: A Single-Subject Study”. Pegem Journal of Education and Instruction, vol. 12, no. 4, Nov. 2022, pp. 384-03, https://www.pegegog.net/index.php/pegegog/article/view/4343.