Masud, Mannan, et al. “EXPERIENECE OF LAPAROSCOPIC CHOLECYSTECTOMY IN EMPYEMA OF GALLBLADDER AT TERTIARY CARE HOSPITAL: Cholecystectomy in Empyema of Gallbladder”. Pakistan Armed Forces Medical Journal, vol. 68, no. 4, Aug. 2018, pp. 818-21, https://pafmj.org/PAFMJ/article/view/89.