Cita APA (7th ed.)

Walker, W. A. (2004). Pediatric gastrointestinal disease, Fourth edition. BC Decker Inc.

Cita Chicago (17th ed.)

Walker, W. Allan. Pediatric Gastrointestinal Disease, Fourth Edition. Hamilton, Ontario: BC Decker Inc, 2004.

Cita MLA (8th ed.)

Walker, W. Allan. Pediatric Gastrointestinal Disease, Fourth Edition. BC Decker Inc, 2004.