Damani, Shireen A.A Ramzanali, et al. “COMPARISON OF OPERATIVE TIME AND LENGTH OF HOSPITAL STAY IN LAPAROSCOPIC CHOLECYSTECTOMY IN ACUTE VERSES CHRONIC CHOLECYSTITIS”. Journal of Ayub Medical College Abbottabad, vol. 27, no. 1, Mar. 2015, pp. 102-4, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/1078.