Safitri, Y. A. “Effect of Bacillus Firmus Bacteria on Total Vibrio Harveyi Bacteria and Vanname Shrimp Survival (Litopenaeus Vannamei)”. Contributions of Central Research Institute for Agriculture, vol. 15, no. 4, Oct. 2021, pp. 89-94, doi:10.59651/cceria.v15i4.48.