Mosback, Vivienne. “Reading Vocabulary Levels in Freshman Textbooks at the National University and the Implications for Materials Selection in English Language Service Courses”. The Ethiopian Journal of Education 7, no. 2 (December 31, 2024): 32–38. Accessed January 11, 2025. http://ejol.aau.edu.et/index.php/EJE/article/view/11047.