Ricarde , C. J. C. . “Student-Centered Learning Strategy in Teaching Selected Topics of World History (Kasaysayan Ng Daigdig)”. Ascendens Asia Singapore – Union Christian College Philippines Journal of Multidisciplinary Research Abstracts, vol. 1, no. 1, Dec. 2018, https://ojs.aaresearchindex.com/index.php/aasguccphjmra/article/view/458.