Simamora, Diana Falentina, and Hisar Marulitua Manurung. “The Effect Of Problem-Based Learning Model During Pandemic On The Thematic Learning Outcomes Of Students In Elementary School”. Jurnal Basicedu 5, no. 5 (August 14, 2021): 3073–3088. Accessed July 22, 2024. https://jbasic.org/index.php/basicedu/article/view/1242.