Agustinsa, R., V. Anjasari, and N. A. Yensy. “The Effect of Problem Based Learning Models Using Contextual Worksheets on Middle School Students’ Mathematical Problem Solving Ability”. Edumatica : Jurnal Pendidikan Matematika, vol. 13, no. 1, May 2023, pp. 48-56, doi:10.22437/edumatica.v13i01.24387.