Kusriyati, Eko Darmanto, Sumaji. Problem-Based Student Work Sheet Development to Improve Learning Outcomes Mathematics of Elementary School Class Students. ICCCM JSSH [Internet]. 2024 Jul. 5 [cited 2025 Jun. 16];3(3):81-93. Available from: https://www.ejicccm.com/index.php/icccmjssh/article/view/209