Harjono, Ahmad, Gunawan Gunawan, Rabiatul Adawiyah, and Lovy Herayanti. 2020. “An Interactive E-Book for Physics to Improve Students’ Conceptual Mastery”. International Journal of Emerging Technologies in Learning (iJET) 15 (05):pp. 40-49. https://doi.org/10.3991/ijet.v15i05.10967.