Dabdoub, Marwan, and Omer Al-Rawi. “Use of Qualitative Control and Discriminatory Function in Applied Studies”. Journal of Education and Science 19, no. 1 (January 1, 2007): 203–220. Accessed September 17, 2025. https://ojs.uomosul.edu.iq/index.php/edusj/article/view/42441.