APA (7th ed.) Citation

ScienceDirect (Online service), Wyllie, R., Hyams, J. S., & Kay, M. (2021). Pediatric gastrointestinal and liver disease (Sixth edition.). Elsevier.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), R. Wyllie, Jeffrey S. Hyams, and Marsha Kay. Pediatric Gastrointestinal and Liver Disease. Sixth edition. Philadelphia: Elsevier, 2021.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Pediatric Gastrointestinal and Liver Disease. Sixth edition. Elsevier, 2021.