Safian, N., Shah, S.A., Idrus, S. and Hamzah, W.M. 2008. Cluster analysis of typhoid cases in Kota Bharu, Kelantan, Malaysia. Medical Journal of Indonesia. 17, 3 (Aug. 2008), 175–82. DOI:https://doi.org/10.13181/mji.v17i3.319.