Khatun, K. et al. 2015. Quality Assessment of Widal Test in Microbiology Laboratories at Primary and Secondary Level Before and After Implementation of Standard Operating Procedure (SOP): A Comparative Study. Journal of Dhaka Medical College. 23, 2 (Oct. 2015), 227–233. DOI:https://doi.org/10.3329/jdmc.v23i2.25396.