Spence, J. T., & Cotton, J. W. (1990). Elementary statistics (5th ed.). Prentice Hall.
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Chicago-čujuhus (17. p.)
Spence, Janet T., juo John W. Cotton. Elementary Statistics. 5th ed. New Jersey: Prentice Hall, 1990.
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MLA-čujuhus (9. p.)
Spence, Janet T., juo John W. Cotton. Elementary Statistics. 5th ed. Prentice Hall, 1990.
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