Khatun, K., Muazzam, N., Shamsuzzaman, S., Kamal, A. M. and Islam, M. S. (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), pp. 227–233. doi: 10.3329/jdmc.v23i2.25396.