Παραπομπή APA
Freund, J. E., & Williams, F. J. (1977). Elementary business statistics: The modern approach (3d ed.). Englewood Cliffs, N.J.: Prentice-Hall.
Παραπομπή Chicago StyleFreund, John E., and Frank J. Williams. Elementary Business Statistics: The Modern Approach. 3d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1977.
Παραπομπή MLAFreund, John E., and Frank J. Williams. Elementary Business Statistics: The Modern Approach. 3d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1977.
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