1. Treatment of tuberculosis: guidelines for national programmes, Third edition,2003
2. Management of tuberculosis. A guide for low income countries. (Fifth Edition);Enarson,2000
3. Optimal tuberculosis case detection by direct sputum smear microscopy: how much better is more?;Van Deun;Int J Tuberc Lung Dis,2002
4. How many sputum specimens are necessary to diagnose pulmonary tuberculosis?;Leonard;Am J Infect Control,2005
5. Smear examination of two specimens for diagnosis of pulmonary tuberculosis in Tiruvallur District, south India;Gopi;Int J Tuberc Lung Dis,2004