Andra, D. (2022). Efforts to Improve Students’ Mathematical Problem-Solving Ability by Applying Guided Discovery Method in Class VII SMP PAB 2 Helvetia T.A. 2021/2022. Jurnal Riset Ilmu Pendidikan, 2(2), 65–71. https://doi.org/10.56495/jrip.v2i2.97