Jayarathne, Avanthi, and W. D. Chandrasena. 2020. “INVESTIGATION OF THE EFFECTIVENESS OF USING SELF-DETERMINATION THEORY IN TEACHING SCIENCE FOR GRADE EIGHT STUDENTS: A CASE STUDY IN SRI LANKA”. International Journal of Research -GRANTHAALAYAH 7 (4):126-31. https://doi.org/10.29121/granthaalayah.v7.i4.2019.881.