Riswari, Lovika, Heri Yanto, and Ali Sunarso. “The Effect of Problem Based Learning by Using Demonstration Method on The Ability of Problem Solving”. Journal of Primary Education 7, no. 3 (August 2, 2018): 356-362. Accessed July 18, 2024. https://journal.unnes.ac.id/sju/jpe/article/view/24519.