Malik, Arshad M., et al. “LAPAROSCOPIC CHOLECYSTECTOMY IN THE ELDERLY PATIENTS. AN EXPERIENCE AT LIAQUAT UNIVERSITY HOSPITAL JAMSHORO”. Journal of Ayub Medical College Abbottabad, vol. 19, no. 4, Dec. 2007, pp. 45-48, https://demo.ayubmed.edu.pk/index.php/jamc/article/view/5058.