Sumiati, Revias, dan Ahmad Syapawi, “COAL ASH WASTE UTILIZATION FOR MAKING PAVING BLOCK OF ECO-FRIENDLY”, PSF, vol. 1, no. 2, hlm. 72–80, Mei 2023, Diakses: Nov 12, 2026. Tersedia pada: https://jurnal.polsri.ac.id/index.php/semnasfirst/article/view/5666