Harnita, Rismiyanto, Sumaji. The Effectiveness of Problem-Based Learning Model Towards Students’ Learning Outcomes of Natural Science Class V Elementary School in Gugus Gajah Mada Sub-District Bonang, Demak Regency. UJSSH [Internet]. 2022 Sep. 16 [cited 2024 Nov. 21];1:29-35. Available from: https://ujssh.com/index.php/ujssh/article/view/16