Adzami, N. S., M. F. Ghazali, A. H. Ramli, H. A. Tajarudin, and Z. Daud. “A New Potential of Scalable Method for the Production of Calcium Carbonate by Bacillus Sphaericus in Batch Fermentation”. International Journal of Integrated Engineering, Vol. 10, no. 9, Jan. 2019, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/2406.