APA Style

Feldman, M., Friedman, L, S. (2021). Sleisenger and Fordtran's Gastrointestinal and Liver Disease (11th). Canada: Elsevier.

MLA Style

Feldman, Mark., Friedman, Lawrence, S.. "Sleisenger and Fordtran's Gastrointestinal and Liver Disease". 11th Canada: Elsevier, 2021. TextBook.