Narayanan, A., S. Sundararaman, L. Varadhan, N. Reay-Jones, and V. Gupta V. “The Value of Flexible Sigmoidoscopy in the Evaluation of Rectal Bleeding in the Young”. International Surgery Journal, vol. 2, no. 2, Dec. 2016, pp. 214-7, https://www.ijsurgery.com/index.php/isj/article/view/548.