Javaid, A., S. R. Awan, Z. A. Syed, Z. H. Iqbal, C. M. Akram, K. Shah, Z. Shaheen, S. U. Khan, R. Hasan, and A. Zafar. “Primary Drug Resistance to Antituberculous Drugs in Punjab Pakistan”. Pakistan Journal of Chest Medicine, vol. 17, no. 1, Mar. 2011, https://pjcm.net/index.php/pjcm/article/view/133.