Syafyudin, Buyung Adnan, rizal Rizal, and wandi Rusfiandi. “THE USE OF COCONUT SHELL CHARCOAL AS AN ADDED MATERIAL TO THE CONCRETE MIX OF Fc’ 14,53 MPa”. RETENSI 1, no. 2 (June 30, 2021): 43-49. Accessed June 8, 2025. https://ejurnal.polnep.ac.id/index.php/Retensi/article/view/321.