Michael, Kassa, and Mengistu Hailu. “Summer Upgrading Program at Colleges of Teacher Education and Its Impact on Improving Teachers’ Professional Growth and Students’ Achievement: Experiences from Tigray, Ethiopia”. The Ethiopian Journal of Education 42, no. 2 (June 20, 2023): 1–33. Accessed April 4, 2025. https://ejol.aau.edu.et/index.php/EJE/article/view/4242.