American Gastroenterological Association. (2004). Gastroenterology. W.B. Saunders.
Citação do estilo Chicago (17ª ed.)American Gastroenterological Association. Gastroenterology. Philadelphia, Pa: W.B. Saunders, 2004.
Citação MLA (8ª ed.)American Gastroenterological Association. Gastroenterology. W.B. Saunders, 2004.
警告：这些引文格式不一定是100％准确.