Febriani DRS, Widjanarko M, Ismaya EA. The Development of Student Activities Sheet Based on The Problem-Based Learning Model of Social Science Learning Class IV Elementary School. ICCCM JSSH [Internet]. 2022 Sep. 11 [cited 2024 Nov. 21];1:1-6. Available from: https://ejicccm.com/index.php/icccmjssh/article/view/38