Ismathulhuda, A. et al. 2022. Validity and Practicality of Project-Based e-Student Worksheet on Thermochemical Materials to Improve Learning Outcomes . Jurnal Penelitian Pendidikan IPA. 8, 3 (Jul. 2022), 1433–1441. DOI:https://doi.org/10.29303/jppipa.v8i3.1691.