Ruth, Samuel Iwanger. “Effects of Cooperative Instructional Strategy and Concept Mapping-Guided Discovery Integrated Instructional Approach on Basic Science Students’ Attitude, Achievement and Retention”. The International Journal of Humanities & Social Studies 6, no. 6 (June 30, 2018). Accessed July 3, 2024. https://internationaljournalcorner.com/index.php/theijhss/article/view/131234.