Diagnosing and treating tuberculosis. American Lung Association. 2015. Accessed September 2015. http://www.lung.org/lung-health-and-diseases/lung-disease-lookup/tuberculosis/diagnosing-and-treating-tuberculosis.html.
Tuberculosis (TB) fact sheet. 2012. US Dept of Health and Human Services, Centers for Disease Prevention and Control. Accessed September 2014. http://www.cdc.gov/tb/publications/factsheets/testing/skintesting.htm.
Tuberculosis (TB). US Dept of Health and Human Services, Centers for Disease Prevention and Control. May 25, 2012. Accessed July 26, 2012. http://www.cdc.gov/tb/topic/treatment/ltbi.htm.