Villanueva, M. R. T. ., and G. P. Cortezano. “16. Effectiveness of Observe and Relate Self-Approach (Orsa) in Enhancing the Grammatical Competence: A Quantitative Study from Looc Integrated School at the Philippines”. International Journal of Management, Entrepreneurship, Social Science and Humanities, vol. 4, no. 2, Dec. 2021, pp. 229-30, doi:10.31098/ijmesh.v4i2.667.