Usang, U. E., A. W. Inyang, I. E. Nwachukwku, and J.-D. C. Emehute. “Typhoid Perforation in Children: An Unrelenting Plague in Developing Countries”. The Journal of Infection in Developing Countries, Vol. 11, no. 10, Oct. 2017, pp. 747-52, doi:10.3855/jidc.9304.