Khalid, Sadaf, Zahid Iqbal, and Afsar Ali Bhatti. 2017. “EARLY VERSUS DELAYED LAPAROSCOPIC CHOLECYSTECTOMY FOR ACUTE CHOLECYSTITIS”. Journal of Ayub Medical College Abbottabad 29 (4):570-73. https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/3285.