APA Style

Weisiger, R. et al (1999). Sleisenger & Fordtran's Gastrointestinal and liver disease :review and assessment . Philadelphia, Pa. :: Saunders,.

MLA Style

Weisiger, Richard.. et al. "Sleisenger & Fordtran's Gastrointestinal and liver disease :review and assessment". Philadelphia, Pa. :: Saunders,, 1999. Text.