TY  - BOOK
AU  - Aldridge Alan
AU  -  Levine Ken
TI  - Surveying the social world :  Principles and practice in Survey Research   
T2  - Understanding Social Research
SN  - 0335202411
U1  - Yb4, P1 
PY  - 2001///
CY  - Buckingham
PB  - Open University         
N1  - Bibliography : P190-193; Appendix : P184-189; Glossary : P 176-183
ER  -