Galappaththi, I. D. L., R. Dissanayake, T. W. Welgama, U. A. Somachandara, R. S. Weerarathna, and G. Y. Pathirana. “Identifying the Empirical Gaps in the Relationships Between Student Engagement and Their Academic Achievement: Future Research Perspectives”. South Asian Journal of Social Studies and Economics, Vol. 5, no. 4, Jan. 2020, pp. 1-8, doi:10.9734/sajsse/2019/v5i430150.