Norusis, M. J. (2002). SPSS 11.0 guide to data analysis [ada CD]. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Norusis, Marija J. SPSS 11.0 Guide to Data Analysis [ada CD]. Prentice Hall, 2002.
Lua MLA (8ú heag.)Norusis, Marija J. SPSS 11.0 Guide to Data Analysis [ada CD]. Prentice Hall, 2002.
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