Khan, Shafinaz, et al. “Comparison of Results Obtained by Widal Agglutination Test & Polymerase Chain Reaction Among Clinically Suspected Typhoid Fever Cases”. Bangladesh Journal of Physiology and Pharmacology, vol. 30, no. 2, Mar. 2015, pp. 46-50, doi:10.3329/bjpp.v30i2.22683.