Gani, Irwan, et al. “The Effect of Adding Shells As Aggregate on the Level of Tensile Strength of Concrete”. Zona Laut Jurnal Inovasi Sains Dan Teknologi Kelautan, vol. 4, no. 3, Nov. 2023, pp. 361-7, doi:10.62012/zl.v4i3.31756.