Almaidah, A., Abram, P. H., & Diah, A. W. M. (2019). The Implementation of Problem Based Learning (PBL) Model toward Students’ Learning Outcomes in the Class XI IPA on Colloid Material at SMA Negeri 9 Palu. Jurnal Akademika Kimia, 8(4), 197–203. https://doi.org/10.22487/j24775185.2019.v8.i4.pp197-203