Mohamad Izwan Saifudin Bin Mohd Zainuri, et al. “Emerging Natural Fiber-Reinforced Cement Materials and Technology for 3D Concrete Printing: A Review”. International Journal of Integrated Engineering, vol. 12, no. 3, Feb. 2020, pp. 161-77, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/5343.