George,Darren, & Mallery, P. (2006). SPSS for Windows step by step: A simple guide and reference,13.0update (6th ed.). Pearson A and B.
Lua i Stíl Chicago (17ú heag.)George,Darren, agus Paul Mallery. SPSS for Windows Step by Step: A Simple Guide and Reference,13.0update. 6th ed. Boston ; New Delhi: Pearson A and B, 2006.
Lua MLA (8ú heag.)George,Darren, agus Paul Mallery. SPSS for Windows Step by Step: A Simple Guide and Reference,13.0update. 6th ed. Pearson A and B, 2006.
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