Rahimi, N. M., N. A. Faisal, M. Y. Kamarudin, and R. Tukimin. “The Effectiveness of Differentiated Learning Method on Motivation and Achievement of Foreign Language Learning”. Religación, Vol. 4, no. 19, Sept. 2019, pp. 161-4, https://revista.religacion.com/index.php/religacion/article/view/449.