Darren George & Paul Mallery. (2008). Spss for Windows Step by Step: A simple guide and reference : 15.0 update (8th ed.). Pearson Education.
Chicago Edition CitationDarren George and Paul Mallery. Spss for Windows Step by Step: A Simple Guide and Reference : 15.0 Update. 8th ed. Pearson Education, 2008.
MLA Edition CitationDarren George and Paul Mallery. Spss for Windows Step by Step: A Simple Guide and Reference : 15.0 Update. 8th ed. Pearson Education, 2008.
Warning: These citations may not always be 100% accurate.