Raja Mohd Sonee, Raja Muhamad Ghouse, et al. “The Properties of Hydroxyapatite Derived from Carbonate Eggshell Waste Through Ball Milling and Heat Treatment Method”. International Journal of Integrated Engineering, vol. 16, no. 8, Nov. 2024, pp. 112-20, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/18033.