Togatorop, Y. A., Suyanti, R. D., & Simorangkir, M. (2026). Problem-Solving Learning: A Systematic Literature Review of Learning Outcomes and Thinking Skills. AL-ISHLAH: Jurnal Pendidikan, 18(3), 3840–3858. https://doi.org/10.35445/alishlah.v18i3.10043