Yasin, M., N. Mahmood, S. A. S. Naqvi, H. N. Khan, A. Suleman, H. Sadia, and F. Jan. “Risk Factors for Multidrug Resistant Tuberculosis Among Patients With Pulmonary Tuberculosis at Tertiary Care Hospital”. Pakistan Journal of Chest Medicine, vol. 25, no. 4, July 2020, pp. 151-5, https://pjcm.net/index.php/pjcm/article/view/644.