Salim, H. M., M. D. Puspitarini, Y. Setiwati, and M. Shimabukuro. “Antibacterial Mechanism of Kratom (Mitragyna Speciosa) Methanol Extract on Streptococcus Pneumoniae and Eschericia Coli Bacteria”. Biomolecular and Health Science Journal, vol. 4, no. 2, Oct. 2021, pp. 99-103, doi:10.20473/bhsj.v4i2.28933.