Vithanapathirana, M., and L. Nettikumara. “IMPROVING SECONDARY SCIENCE INSTRUCTION THROUGH CONTENT AND LANGUAGE INTEGRATED LEARNING (CLIL) IN SRI LANKA”. International Online Journal of Education and Teaching, vol. 7, no. 1, Jan. 2020, pp. 141-8, https://www.iojet.org/index.php/IOJET/article/view/684.