Chaudhry, R., D.S. Chandel, G. Mehta, H. Kapoor, and T. Pang. “Molecular Characterization of Drug Sensitive and Drug Resistant Strains of Salmonella Typhi”. Medical Journal of Indonesia 7, no. Supp1 (October 1, 1998): 188. Accessed October 25, 2020. http://mji.ui.ac.id/journal/index.php/mji/article/view/1100.