Elisa, Gida, Heru Kuswanto, Aris Kurniawan, and Nur Inayah Syar. 2026. “Development of a Discovery Learning–Based Physics E-Book to Enhance Students’ Conceptual Understanding of Sound Waves”. Kasuari: Physics Education Journal (KPEJ) 9 (1):203-21. https://doi.org/10.37891/kpej.v9i1.1185.