MLA

Wu, George Y, et al. Nutrition and Gastrointestinal Disease. Humana Press, 2008.

APA

Wu, G. Y, DeLegge, M. H, DeLegge, M., & Karch, S. B. (2008). Nutrition and Gastrointestinal Disease. Humana Press.

Chicago

Wu, George Y., Mark H DeLegge, Mark DeLegge, and Steven B Karch. Nutrition and Gastrointestinal Disease. : Humana Press, 2008.