Cita APA (7a ed.)
National Gastroenterological Association (U.S.) & American College of Gastroenterology. The American journal of gastroenterology. Elsevier.
Cita Chicago Style (17a ed.)
National Gastroenterological Association (U.S.) y American College of Gastroenterology. The American Journal of Gastroenterology. [Amsterdam] : [New York]: Elsevier.
Cita MLA (9a ed.)
National Gastroenterological Association (U.S.) y American College of Gastroenterology. The American Journal of Gastroenterology. Elsevier.
Precaución: Estas citas no son 100% exactas.