Chaudhary, A., et al. “Association of Socio-Demographic Profile With Prevalence of Multi Drug Resistant Tuberculosis Among Retreated Pulmonary Tuberculosis Patients in North India”. SAARC Journal of Tuberculosis, Lung Diseases and HIV AIDS, vol. 16, no. 1, June 2018, pp. 1-5, doi:10.3126/saarctb.v16i1.23238.