Não informado. (1954). The American Journal of Gastroenterology. American College of Gastroenterology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. The American Journal of Gastroenterology. New York: American College of Gastroenterology, 1954.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. The American Journal of Gastroenterology. American College of Gastroenterology, 1954.
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