Savkatovich, D.E. and Situmeang, F.D. 2026. Classroom Loudness Among Children Aged 10–12 and the ZPD-ZQR Framework: A Single-Case Reflective Qualitative Study. Lentera : Jurnal Kajian Bidang Pendidikan dan Pembelajaran. 6, 1 (May 2026), 10–18. DOI:https://doi.org/10.56393/lentera.v6i1.4225.