LEVIN RICHARD I. (2008). STATISTICS FOR MANAGEMENT (7TH.). PEARSON EDUCATION.
Lua i Stíl Chicago (17ú heag.)LEVIN RICHARD I. STATISTICS FOR MANAGEMENT. 7TH. NEW DELHI: PEARSON EDUCATION, 2008.
Lua MLA (9ú heag.)LEVIN RICHARD I. STATISTICS FOR MANAGEMENT. 7TH. PEARSON EDUCATION, 2008.
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