Sudrajat, Kukuh Mahi, Atifa Nuraini, Muhammad Isradi, Joewono Prasetijo, and Abdul Hamid. “Effect of Fly Ash Addition in West Jakarta Cengkareng Area Soil on CBR Value”. Engineering And Technology Journal 8, no. 9 (September 27, 2023): 2795–2800. Accessed July 3, 2024. https://everant.org/index.php/etj/article/view/1043.