Stevenson, C., R. Blaauw, E. Fredericks, J. Visser, and S. Roux. “Food Avoidance in Irritable Bowel Syndrome Leads to a Nutrition-Deficient Diet”. South African Journal of Clinical Nutrition, Vol. 27, no. 1, Aug. 2013, pp. 25-30, http://sajcn.co.za/index.php/SAJCN/article/view/736.