Mela Sundari, Suhirman, and Heny Friantary. “The Effect of Problem Solving Learning Method towards Indonesian Subject Learners’ Learning Outcomes”. Jadila: Journal of Development and Innovation in Language and Literature Education 2, no. 4 (September 5, 2021): 423-437. Accessed December 7, 2021. https://ejournal.karinosseff.org/index.php/jadila/article/view/226.