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Ernst E. Colonic irrigation and the theory of auto-intoxication: a triumph of ignorance over science. „Journal of Clinical Gastroenterology”. 24 (4), s. 196–8, 1997. DOI: 10.1097/00004836-199706000-00002. PMID: 9252839.
Müller-Lissner SA, Kamm MA, Scarpignato C, Wald A. Myths and misconceptions about chronic constipation. „The American Journal of Gastroenterology”. 100 (1), s. 232–42, 2005. DOI: 10.1111/j.1572-0241.2005.40885.x. PMID: 15654804.