Freund, J. E., & Williams, F. J. (1982). Elementary business statistics: The modern approach (4th edition.). Prentice-Hall,Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFreund, John E., और Frank J. Williams. Elementary Business Statistics: The Modern Approach. 4th edition. Englewood Cliffs, New Jersey: Prentice-Hall,Inc, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFreund, John E., और Frank J. Williams. Elementary Business Statistics: The Modern Approach. 4th edition. Prentice-Hall,Inc, 1982.
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