Vardeman, S. B. (1994). Statistic for Engineering Problem Solving. PWS.
Lua i Stíl Chicago (17ú heag.)Vardeman, Stephen B. Statistic for Engineering Problem Solving. PWS, 1994.
Lua MLA (8ú heag.)Vardeman, Stephen B. Statistic for Engineering Problem Solving. PWS, 1994.
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