Gaol, Eriyen Gustien Lumban, Ramlan Silaban, Ajat Sudrajat, Marham Sitorus, and Zuhairiah Nst. 2026. “Analysis of the Need to Develop Innovative Teaching Materials Based on Problem-Based Learning (PBL) Integrated With the Local Wisdom of Marpangir Batak Toba on the Topic of Electrolyte and Non-Electrolyte Solutions”. Panthera : Jurnal Ilmiah Pendidikan Sains Dan Terapan 6 (4):2602-11. https://doi.org/10.36312/panthera.v6i4.1678.