APA
(1987). Journal of Practical Gastroenterology. New York: American college of Gastroenterology.
Chicago
1987. Journal of Practical Gastroenterology. New York: American college of Gastroenterology.
Harvard
(1987). Journal of Practical Gastroenterology. New York: American college of Gastroenterology.
MLA
Journal of Practical Gastroenterology. New York: American college of Gastroenterology. 1987.
