Ashfaq, Asim, and Irfan Shukr. “GALLSTONE ILEUS: A RARE COMPLICATION OF GALLSTONES, AND CAUSE OF INTESTINAL OBSTRUCTION”. Pakistan Armed Forces Medical Journal, vol. 55, no. 1, Oct. 2018, pp. 78-79, https://pafmj.org/PAFMJ/article/view/1192.