TY  - BOOK
AU  - Lewis-Beck Michael S Ed.
AU  -  Bryman Alan Ed.
AU  -  Liao Tim Futing Ed.
TI  - Sage encyclopedia of social science reseaech methods.3V
U1  - Sigma :f    RR, P4.1-.3 
PY  - 2004///
CY  - London
PB  - Sage Publication      
ER  -