Freund,John E, & Williams,Frank J. Elementary business statistics: The modern approach (2nd ed.). Prentice-Hall.
芝加哥风格引文Freund,John E, 与 Williams,Frank J. Elementary Business Statistics: The Modern Approach. 2nd ed. Englewood: Prentice-Hall.
MLA引文Freund,John E, 与 Williams,Frank J. Elementary Business Statistics: The Modern Approach. 2nd ed. Prentice-Hall.
警告：这些引文格式不一定是100％准确.