TY  - BOOK
AU  - Blalock H M Ed.
TI  - Causal models in the social sciences
T2  - Methodological Perspectives
SN  - 333 13370 6
U1  - Sigma:(B), L1 
PY  - 1971///
CY  - London
PB  - Macmillan U K        
KW  - Social Science
ER  -