Deni Susanti, Rika, Indra Kesuma Hadi, Sahat Sitompul, and Ibnu Shubhan. “Effect Bottom Ash As Partial Substitute of Sand on Compression Strength of Concrete”. International Journal of Engineering & Technology 7, no. 4 (May 11, 2019): 6084–6087. Accessed December 22, 2024. https://sciencepubco.com/index.php/ijet/article/view/20854.