Kristi, D. and Andriani, A.E. 2023. The Development of E-Books Based on Problem Based Learning to Improve Science Learning Outcomes. Jurnal Penelitian Pendidikan IPA. 9, SpecialIssue (Dec. 2023), 828–835. DOI:https://doi.org/10.29303/jppipa.v9iSpecialIssue.6505.