George, D. (2012). Spss for windows step by step: a: Simple guide and reference 17.0. Pearson.
Citazione stile Chigago Style (17a edizione)George, Darren. Spss for Windows Step by Step: A: Simple Guide and Reference 17.0. New Delhi: Pearson, 2012.
Citatione MLA (9a ed.)George, Darren. Spss for Windows Step by Step: A: Simple Guide and Reference 17.0. Pearson, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.