Haetami, Aceng, et al. “Investigation of Problem-Based Learning (PBL) on Physics Education Technology (PhET) Simulation in Improving Student Learning Outcomes in Acid-Base Material ”. Jurnal Penelitian Pendidikan IPA, vol. 9, no. 11, Nov. 2023, pp. 9738-4, doi:10.29303/jppipa.v9i11.4820.