Gupta, A., J. P. Mathuria, S. K. Singh, A. K. Gulati, and S. Anupurba. “Antitubercular Drug Resistance in Four Healthcare Facilities in North India”. Journal of Health, Population and Nutrition, vol. 29, no. 6, Feb. 2012, pp. 583-92, doi:10.3329/jhpn.v29i6.9895.