APA Style

Walker, W, A. et al (2004). Pediatric Gastrointestinal Disease (4th edn. Vol- 2). Hamilton, Ontario: BC Decker Inc..

MLA Style

Walker, W., Allan. et al. "Pediatric Gastrointestinal Disease". 4th edn. Vol- 2 Hamilton, Ontario: BC Decker Inc., 2004. Text.