N. Md Nawawi, N. Zuhaimi, K. Sabu, N. S. R. Mahamud, and N. A. Moh Nasir, “CEFR for Languages and Its Effective Implementation in Secondary Schools in Malaysia”, AJATeL, vol. 11, no. 1, pp. 63–72, Jun. 2021, doi: 10.37134/ajatel.vol11.1.6.2021.