APA Style

Feldman, M., Friedman, L, S. (2021). Sleisenger & Fordtran"s Gastrointestinal &Liver Disease - Volume 1 (11th ed.). : Elsevier.

MLA Style

Feldman, Mark., Friedman, Lawrence, S. "Sleisenger & Fordtran"s Gastrointestinal &Liver Disease - Volume 1". 11th ed. : Elsevier, 2021. Text.