Kusriyati, Eko Darmanto, Sumaji. Problem-Based Student Work Sheet Development to Improve Learning Outcomes Mathematics of Elementary School Class Students. ICCCM JSSH [Internet]. 2024 May 14 [cited 2025 Jul. 31];3(3):81-93. Available from: https://ejicccm.com/index.php/icccmjssh/article/view/209