Tagupa, Eubert R., and Alvic A. Arnado. “Development and Validation of Motivational Manipulative Learning Materials (MMLMs) for the Least-Learned Competencies of Grade 9 Trigonometry”. International Journal of Membrane Science and Technology 10, no. 2 (June 21, 2023): 1002-1022. Accessed May 19, 2024. https://cosmosscholars.com/phms/index.php/ijmst/article/view/1379.