Lozano, J. N., and J. Labro. “Age of Entry As Determinant of Achivement in The Elementary Grades: A Comparative Study”. SSU - Digital Archive for Theses and Dissertations, vol. 18, no. 1, Aug. 2022, pp. 1-114, https://datd.ssu.edu.ph/index.php/datd/article/view/157.