Norusis, M. J. (1994). SPSS professional statistics 6.1. SPSS Inc.
Chicago Style aipamenaNorusis, Marija J. SPSS Professional Statistics 6.1. Chicago, Ill: SPSS Inc, 1994.
MLA aipamenaNorusis, Marija J. SPSS Professional Statistics 6.1. SPSS Inc, 1994.
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