Center for Disease Control and Prevention. Tuberculosis (TB). Tests and Diagnosis. US Dept of Health and Human Services, Centers for Disease Control and Prevention. 05/25/11. Accessed 9/30/11 from http://www.cdc.gov/tb/topic/testing/default.htm.
"TB | Testing & Diagnosis." Centers for Disease Control and Prevention. Web. <http://www.cdc.gov/tb/topic/testing/default.htm>.