APA引文

Russell, R. C., & Dudley, H. (1975). Letter: Dangers of silent gall stones.

Citação norma Chicago

Russell, R C., and H. Dudley. Letter: Dangers of Silent Gall Stones. 1975.

MLA引文

Russell, R C., and H. Dudley. Letter: Dangers of Silent Gall Stones. 1975.

警告：這些引文格式不一定是100％准確.