Shaikh, Zoya, et al. “Clinical Spectrum of Colorectal Cancer: Experience of 186 Patients from Jinnah Postgraduate Medical Centre Karachi”. Journal of Fatima Jinnah Medical University, vol. 13, no. 1, Apr. 2019, pp. 12-17, https://www.jfjmu.com/index.php/ojs/article/view/614.