Jha, N, and S Kumar. “Are We Progressing towards Elimination of Diphtheria, Pertusis, Tetanus from Nepal?”. Kathmandu University Medical Journal 6, no. 4 (April 13, 2009): 520–525. Accessed December 27, 2024. https://nepjol.info./index.php/KUMJ/article/view/1749.