1. [http://www.who.int/mediacentre/factsheets/fs104/en/index.html
2. Techniques for diagnosis of tuberculosis;Ramachandran;Indian J Tuberc,2003
3. Tuberculosis among immigrants: Interval from arrival in Canada to diagnosis. A 5-year study in southern Alberta;Cowie;Can Med Assoc J,1998
4. Extrapulmonary tuberculosis;Sharma;Indian J Med Res,2004