S. R. Swarna, S. Sivagurunathan, T. Bharathi, M. Kumar, M. Lavanya, and D. Jeyakumari, Trans., “Diphtheria in adult - A case report”, Indian J Case Reports, vol. 6, no. 4, pp. 160–162, Apr. 2020, doi: 10.32677/IJCR.2020.v06.i04.004.