Principio, Neslyn L., et al. “Mechanical Properties of Concrete With Recycled High-Density Polyethylene Macro Flat Fiber and Rice Hull Ash As Partial Replacement to Cement”. International Journal of Integrated Engineering, vol. 14, no. 9, Dec. 2022, pp. 24-30, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/11397.