Aguilar, T., N. A. Acosta, and A. Dacuro. “Effects of Self-Instructional Materials on the Reading Levels of Grade Four Pupils”. SSU - Digital Archive for Theses and Dissertations, vol. 7, no. 1, Mar. 2023, pp. 1-352, https://datd.ssu.edu.ph/index.php/datd/article/view/304.