Walker, W. A., Goulet, O., Kleinman, R. E., Sherman, P. M., Shneider, B. L., & Sanderson, I. R. (2004). Pediatric gastrointestinal disease, Fourth edition: Pathophysiology, diagnosis, management / W. Allan Walker ; Olivier Goulet. [Contributors: Ana Abad-Sinden.] (4th ed.). BC Decker Inc.

Walker, W. Allan, Olivier Goulet, Ronald E. Kleinman, Philip M. Sherman, Benjamin L. Shneider, and Ian R. Sanderson. Pediatric Gastrointestinal Disease, Fourth Edition: Pathophysiology, Diagnosis, Management / W. Allan Walker ; Olivier Goulet. [Contributors: Ana Abad-Sinden.]. 4th ed. Hamilton, Ontario: BC Decker Inc, 2004.

Walker, W. Allan, et al. Pediatric Gastrointestinal Disease, Fourth Edition: Pathophysiology, Diagnosis, Management / W. Allan Walker ; Olivier Goulet. [Contributors: Ana Abad-Sinden.]. 4th ed. BC Decker Inc, 2004.