George,Darren, & Mallery, P. (2006). SPSS for Windows step by step: A simple guide and reference,13.0update (6th ed.). Pearson A and B.
Citazione stile Chigago Style (17a edizione)George,Darren, e 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.
Citatione MLA (8a ed.)George,Darren, e Paul Mallery. SPSS for Windows Step by Step: A Simple Guide and Reference,13.0update. 6th ed. Pearson A and B, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.