APA Style

Qayed, E., Shahnavaz, N. (2021). Gastrointestinal and Liver Disease: Review and Assessment 11th ed. (11th edition). Philadelphia: Elsevier.

MLA Style

Qayed, Emad., Shahnavaz, Nikrad. "Gastrointestinal and Liver Disease: Review and Assessment 11th ed.". 11th edition Philadelphia: Elsevier, 2021. E-Book.