TY  - BOOK
AU  - Bryman,Alan
AU  - Cramer,Duncan
TI  - Quantitative data analysis with SPSS for windows: a guide for social scientists 
SN  - 0415147204
PY  - 1997///
CY  - London
PB  - Routledge
KW  - Social sciences
KW  - Statistical methods
KW  - Computer programs
KW  - SPSS for Windows
N1  - page 309-311
ER  -