TY  - BOOK
AU  - George, Darren
AU  - Mallery, Paul
TI  - SPSS for windows Step by Step: a simple guide and reference 17.0 update 
SN  - 9788131762257
PY  - 2012///
CY  - New Delhi
PB  - Dorling Kindersley
KW  - Spss
KW  - Statistical Package For Social Sciences
ER  -