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2. Changing epidemiology of tuberculosis in Singapore, 2002-2011;Suhana;Epidemiol News Bull,2012
3. World Health Organization Global Tuberculosis Report 2015 2015 http://apps.who.int/iris/bitstream/10665/191102/1/9789241565059_eng.pdf?ua=1
4. Joint United Nations Programme on HIV/AIDS (UNAIDS): 2015 Progress reports submitted by countries http://www.unaids.org/sites/default/files/country/documents/SGP_narrative_report_2015.pdf
5. World Health Organization (WHO): Global Health Observatory data repository http://apps.who.int/gho/data/view.main.22500WHOREG?lang=en