Pearl, R. (1926). Vital statistics of the National Academy of Sciences. s.n..
芝加哥风格引文Pearl, Raymond. Vital Statistics of the National Academy of Sciences. [U.S.: s.n., 1926.
MLA引文Pearl, Raymond. Vital Statistics of the National Academy of Sciences. s.n., 1926.
警告：这些引文格式不一定是100％准确.