Santiago, J. G., and J. D. Dagdag. “The Effect of Mother Tongue-Based Multilingual Education on the Science Achievement and Metacognitive Learning Orientations of Ilocano Grade 3 Pupils: Implications for Policy and Practice”. Journal of Research, Policy & Practice of Teachers and Teacher Education, vol. 11, no. 2, Oct. 2021, pp. 46-58, doi:10.37134/jrpptte.vol11.2.4.2021.