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 (March 11, 2021): 32–38. Accessed November 23, 2024. http://ejol.aau.edu.et/index.php/EJE/article/view/1044.