TY  - BOOK
AU  - George, Darren  & Mallery, Paul
TI  - SPSS for windows steps by steps: a simple guide and reference 13.0 update
SN  - 81-317-0394-0
U1  - 005.5 Geo/Mal 
PY  - 2006///
CY  - Pearson Education, New Delhi
ER  -