TY  - BOOK
AU  - George,Darren
AU  - Mallery,Paul
TI  - SPSS for Windows step by step: a simple guide and reference 
SN  - 0205515851
AV  - HA32.G4 2007. 
PY  - 2007///
CY  - Boston
PB  - Allyn and Bacon
KW  - Social sciences
N1  - Includes bibliographical references and index
ER  -