Cita APA (7th ed.)

George,Darren, & Mallery, P. (2006). SPSS for Windows step by step: A simple guide and reference,13.0update (6th ed.). Pearson A and B.

Cita Chicago (17th ed.)

George,Darren, i 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.

Cita MLA (8th ed.)

George,Darren, i Paul Mallery. SPSS for Windows Step by Step: A Simple Guide and Reference,13.0update. 6th ed. Pearson A and B, 2006.