Chatoor D, Emmnauel A (2009). «Constipation and evacuation disorders». Best Pract Res Clin Gastroenterol. 23 (4): 517–30. doi:10.1016/j.bpg.2009.05.001. PMID19647687.
Wallace, J. L. (2000 թ․ փետրվար). «How do NSAIDs cause ulcer disease?». Baillière's Best Practice & Research. Clinical Gastroenterology. 14 (1): 147–159. doi:10.1053/bega.1999.0065. PMID10749095.
Chatoor D, Emmnauel A (2009). «Constipation and evacuation disorders». Best Pract Res Clin Gastroenterol. 23 (4): 517–30. doi:10.1016/j.bpg.2009.05.001. PMID19647687.
Wallace, J. L. (2000 թ․ փետրվար). «How do NSAIDs cause ulcer disease?». Baillière's Best Practice & Research. Clinical Gastroenterology. 14 (1): 147–159. doi:10.1053/bega.1999.0065. PMID10749095.
Wilson, Dodd (1990). «85». In Walker, H. Kenneth; Hall, W. Dallas; Hurst, J. Willis (eds.). Clinical Methods: The History, Physical, and Laboratory Examinations. Boston: Butterworths. ISBN9780409900774.