APA Style

Walker, A, W. et al (1991). Pediatric Gastrointestinal Disease: Pathophysiology, Diagnosis, Management. Vol.1 . Philadelphia: .C Decker Inc.

MLA Style

Walker, Allan, W. et al. "Pediatric Gastrointestinal Disease: Pathophysiology, Diagnosis, Management. Vol.1". Philadelphia: .C Decker Inc, 1991. print.