APA (7th ed.) Citation

Crooks, C. J., West, J., & Card, T. R. (2013). Comorbidities affect risk of nonvariceal upper gastrointestinal bleeding. WB Saunders.

Chicago Style (17th ed.) Citation

Crooks, Colin John, Joe West, and Timothy R. Card. Comorbidities Affect Risk of Nonvariceal Upper Gastrointestinal Bleeding. WB Saunders, 2013.

MLA (9th ed.) Citation

Crooks, Colin John, et al. Comorbidities Affect Risk of Nonvariceal Upper Gastrointestinal Bleeding. WB Saunders, 2013.

Warning: These citations may not always be 100% accurate.