Ricarde , Constantino Jr. C. 2018. “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 1 (1). https://ojs.aaresearchindex.com/index.php/aasguccphjmra/article/view/458.