Lua APA (7ú heag.)

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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