Benson, J. T. M. a. P. G. Statistics for business and economics. Dellen Publishing Company.
Lua i Stíl Chicago (17ú heag.)Benson, James T. McClave and P. George. Statistics for Business and Economics. Dellen Publishing Company.
Lua MLA (8ú heag.)Benson, James T. McClave and P. George. Statistics for Business and Economics. Dellen Publishing Company.
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