Amalya, Cut Putri, Wiwit Artika, Safrida Safrida, Cut Nurmaliah, Muhibbuddin Muhibbuddin, and M. Syukri. 2021. “Implementation of the Problem Base Learning Model Combined With E-STEM Based Student Worksheets on Learning Outcomes and Self Efficacy on Environmental Pollution Materials”. Jurnal Penelitian Pendidikan IPA 7 (SpecialIssue):37-38. https://doi.org/10.29303/jppipa.v7iSpecialIssue.962.