Wijethunga, W., & Chandrasena, W. (2019). INVESTIGATION OF STUDENTS’ PSYCHOLOGICAL ASPECTS ON ACITIVITY BASED LEARNING IN MATHEMATICS: A CASE STUDY IN SRI LANKA. International Journal of Research -GRANTHAALAYAH, 7(4), 270–280. https://doi.org/10.29121/granthaalayah.v7.i4.2019.898