Menike, H.P.R., and W.D. Chandrasena. “INVESTIGATION OF THE EFFECTIVENESS OF USING SELF-DETERMINATION THEORY IN TEACHING BIOLOGY FOR GRADE TEN STUDENTS”. International Journal of Research -GRANTHAALAYAH 7, no. 4 (April 30, 2019): 46–50. Accessed April 29, 2024. https://www.granthaalayahpublication.org/journals/granthaalayah/article/view/IJRG19_A04_2230.