Freund, J. E. (1973). Modern elementary statistics (4th.). Prentice-Hall.
芝加哥风格引文Freund, John E. Modern Elementary Statistics. 4th. New Jersey: Prentice-Hall, 1973.
MLA引文Freund, John E. Modern Elementary Statistics. 4th. Prentice-Hall, 1973.
警告：这些引文格式不一定是100％准确.