Sumiati, Revias, dan Ahmad Syapawi. “COAL ASH WASTE UTILIZATION FOR MAKING PAVING BLOCK OF ECO-FRIENDLY”. Prosiding Semnas First 1, no. 2 (Mei 8, 2023): 72–80. Diakses Juli 3, 2024. https://jurnal.polsri.ac.id/index.php/semnasfirst/article/view/5666.