Harahap, Mukti Hamjah, Winsyahputra Ritonga, and Nova Adelia. “Characteristics of Concrete With Red Sand Mixture 80 Mesh Grain Size After Combustion”. Jurnal Penelitian Pendidikan IPA 9, no. 8 (August 25, 2023): 6540–6547. Accessed November 24, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/3107.