EMMANUEL, J. S., P. BHANDIGADI, and L. K. CH’NG. “Student Engagement and Its Impact on Achievement in a Blended Learning Environment in Malaysia”. Asian Journal of Distance Education, Vol. 14, no. 1, Aug. 2019, pp. 56 -7, https://asianjde.com/ojs/index.php/AsianJDE/article/view/291.