HEALEY JOSEPH F. (1999). STATISTICS: A TOOL FOR SOCIAL RESEARCH (5TH.). INTERNATIONAL THOMSON BUSINESS PRESS.
Chicago-viite (17. p.)HEALEY JOSEPH F. STATISTICS: A TOOL FOR SOCIAL RESEARCH. 5TH. BOSTON: INTERNATIONAL THOMSON BUSINESS PRESS, 1999.
MLA-viite (9. p.)HEALEY JOSEPH F. STATISTICS: A TOOL FOR SOCIAL RESEARCH. 5TH. INTERNATIONAL THOMSON BUSINESS PRESS, 1999.
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