Togatorop, Yuni Arliyana, Retno Dwi Suyanti, and Murniaty Simorangkir. “Problem-Solving Learning: A Systematic Literature Review of Learning Outcomes and Thinking Skills”. AL-ISHLAH: Jurnal Pendidikan 18, no. 3 (September 30, 2026): 3840–3858. Accessed October 13, 2026. https://www.alishlah.ahfpublishing.id/alishlah/article/view/10043.