Paramitha, D., Prasetyo, Z. K. ., Jumadi, J. ., & Siregar, A. N. . (2023). The Influence of Use of Problem-Based Learning E-Book Materials of Optical Equipment on Improving Students’ Critical Thinking Ability. Jurnal Penelitian Pendidikan IPA, 9(11), 9149–9155. https://doi.org/10.29303/jppipa.v9i11.5165