APA citiranje

Crockett, S. D., Barritt, A. S., & Shaheen, N. J. (2009). A 52 year old man with heartburn: Should he undergo screening for Barrett’s esophagus?

Citação norma Chicago

Crockett, Seth D., A. Sidney Barritt, and Nicholas J. Shaheen. A 52 Year Old Man With Heartburn: Should He Undergo Screening for Barrett’s Esophagus? 2009.

MLA citiranje

Crockett, Seth D., A. Sidney Barritt, and Nicholas J. Shaheen. A 52 Year Old Man With Heartburn: Should He Undergo Screening for Barrett’s Esophagus? 2009.