Muhamadul Bakir, Afeeq Busyra binti, and Azlina binti Abdul Aziz. 2022. “Primary School Teachers’ Perceptions on The Effectiveness of CEFR Textbooks in Malaysia: A Systematic Literature Review”. International Journal of Academic Research in Progressive Education and Development 11 (3). https://ijarped.com/index.php/journal/article/view/1711.