Kehinde, O. A., and H. Dada-Adegbola. “EPIDEMIOLOGY OF SMEAR - NEGATIVE TUBERCULOSIS IN IBADAN, NIGERIA”. African Journal of Infectious Diseases (AJID), vol. 7, no. 1, Feb. 2013, pp. 14-17, https://journals.athmsi.org/index.php/AJID/article/view/1778.