Kaleem, F., J. Usman, U. Ali, M. M. Gill, and A. Sattar. “In Vitro Efficacy of Third Generation Cephalosporins Against Nalidixic Acid Resistant and Multi Drug Resistant Salmonella Typhi and Paratyphi via E-Strip Method”. Infectious Diseases Journal of Pakistan, vol. 27, no. 4, Sept. 2022, pp. 89-92, https://ojs.idj.org.pk/index.php/Files/article/view/63.