Gaol, E. G. L., R. Silaban, A. Sudrajat, M. Sitorus, and Z. Nst. “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, vol. 6, no. 4, Oct. 2026, pp. 2602-11, doi:10.36312/panthera.v6i4.1678.