BOOK STEPHEN A. (1977). STATISTICS: BASIC TECHNIQUES FOR SOLVING APPLIED PROBLEMS. MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)BOOK STEPHEN A. STATISTICS: BASIC TECHNIQUES FOR SOLVING APPLIED PROBLEMS. NEW YORK: MCGRAW-HILL, 1977.
Lua MLA (9ú heag.)BOOK STEPHEN A. STATISTICS: BASIC TECHNIQUES FOR SOLVING APPLIED PROBLEMS. MCGRAW-HILL, 1977.
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