Tampubolon, Frist, and Yurni Suasti. “Application of Constructivism Approach to Improve the Quality of Learning Geography”. International Journal of Educational Dynamics 2, no. 2 (June 25, 2020): 73-79. Accessed May 18, 2024. http://ijeds.ppj.unp.ac.id/index.php/IJEDS/article/view/360.