TY  - BOOK
AU  - Burgess, Robert G.
TI  - Key variables in social investigation
SN  - 0710206216
U1  - 310 BUR 
PY  - 1986///
CY  - London
PB  - Routledge & Kegan Paul
KW  - Social sciences - Methodology
N1  - <p>BIBLIOGRAPHY: Includes index</p>
ER  -