Harianja, Ryvaldo, and Abdul Rais. “ANALISIS UJI MEKANIK BETON DENGAN PENGGUNAAN AIR SODA ALAMI ASAL TARUTUNG”. EINSTEIN (e-Journal) 9, no. 3 (October 31, 2021): 35–44. Accessed October 12, 2025. https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/28902.