Afolabi, Babayemi Wasiu, Tolu. O James, G. I Onwuka, and K. G. Yunusa. “Using a Modified Quality Control Charts on Academic Grades of Tertiary Institutions Students”. International Journal of Science for Global Sustainability 9, no. 4 (December 31, 2023): 40–46. Accessed April 16, 2026. https://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/547.