Setiawan, Bramianto, Reza Rachmadtullah, and Vina Iasha. “Problem-Solving Method: The Effectiveness of The Pre-Service Elementary Education Teacher Activeness in The Concept of Physics Content”. Jurnal Basicedu 4, no. 4 (August 30, 2020): 1074–1083. Accessed July 22, 2024. https://jbasic.org/index.php/basicedu/article/view/484.