George, D., & Mallery, P. (2012). IBM SPSS statistics 19 step by step: A simple guide and reference (Twelfth edition.). Pearson.
Citação norma ChicagoGeorge, Darren, and Paul Mallery. IBM SPSS Statistics 19 Step by Step: A Simple Guide and Reference. Twelfth edition. Boston: Pearson, 2012.
Citação norma MLAGeorge, Darren, and Paul Mallery. IBM SPSS Statistics 19 Step by Step: A Simple Guide and Reference. Twelfth edition. Pearson, 2012.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.