(EN) Avoiding Gluten Cross-Contamination, su eatright.org, Academy of Nutrition and Dietetics, 22 de abril de 2014. URL consultato il 20 marzo 2018 (archiviato il 17 marzo 2017).
«For people with celiac disease, even just a microscopic amount of gluten can cause a reaction and damage to the intestines, such as a single bread crumb on a plate or speck of wheat flour on manufacturing equipment.»