Παραπομπή APA
Freund, J. E., Williams, F. J., & Perles, B. M. (1993). Elementary business statistics: The modern approach (6th ed.). New Jersey: Prentice-Hall.
Παραπομπή Chicago StyleFreund, John E., Frank J. Williams, and Benjamin M. Perles. Elementary Business Statistics: The Modern Approach. 6th ed. New Jersey: Prentice-Hall, 1993.
Παραπομπή MLAFreund, John E., Frank J. Williams, and Benjamin M. Perles. Elementary Business Statistics: The Modern Approach. 6th ed. New Jersey: Prentice-Hall, 1993.
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