APA引文

Whitehead, H. M., Brennan, F., & O'Connor, F. A. (1989). Medium and long-term complications of endoscopic sphincterotomy for choledocholithiasis. Ulster Medical Society.

Citação norma Chicago

Whitehead, H. M., F. Brennan, and F. A. O'Connor. Medium and Long-term Complications of Endoscopic Sphincterotomy for Choledocholithiasis. Ulster Medical Society, 1989.

MLA引文

Whitehead, H. M., F. Brennan, and F. A. O'Connor. Medium and Long-term Complications of Endoscopic Sphincterotomy for Choledocholithiasis. Ulster Medical Society, 1989.

警告：這些引文格式不一定是100％准確.