Nogodalla, M. A., and A. I. Abdelghani. “Impact of Staff Qualification and Training on Performance of the Core Function Activities (CFA) of the Communicable Disease Surveillance System, Gazera State, Sudan, 2009”. Online Journal of Public Health Informatics, vol. 6, no. 1, Mar. 2014, doi:10.5210/ojphi.v6i1.5113.