Usman, D.N., Gupta, D.R., Khan, D.S. and Mittal, D.S. 2012. Ultrasonographic Study Of Correlation Between Development Of Gallstones With Morphology Of Gallbladder And Common Bile Duct In North Indian Population: Ultrasonographic Study Of Development Of Gallstones. National Journal of Integrated Research in Medicine. 3, 2 (Jun. 2012), 41–44.