Norusis, M. J. (2000). SPSS 13.0 guide to data analysis. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Norusis, M. J. SPSS 13.0 Guide to Data Analysis. Upper Saddle River, N.J.: Prentice Hall, 2000.
Lua MLA (9ú heag.)Norusis, M. J. SPSS 13.0 Guide to Data Analysis. Prentice Hall, 2000.
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