APA引文

Bentley, H. R. (1975). Letter: Tar and nicotine yields of cigarettes.

Citação norma Chicago

Bentley, H R. Letter: Tar and Nicotine Yields of Cigarettes. 1975.

MLA引文

Bentley, H R. Letter: Tar and Nicotine Yields of Cigarettes. 1975.

警告：這些引文格式不一定是100％准確.