Agustinsa, R. et al. 2023. The Effect of Problem Based Learning Models Using Contextual Worksheets on Middle School Students’ Mathematical Problem Solving Ability. Edumatica : Jurnal Pendidikan Matematika. 13, 1 (May 2023), 48–56. DOI:https://doi.org/10.22437/edumatica.v13i01.24387.