TY  - BOOK
AU  - Blalock H M
TI  - Casual inferences in non-experimental research
U1  - 300.151 
PY  - 1964///
CY  - Chapel Hill
PB  - Univ. of North Carolina Press
KW  - Social sciences-mathematical models
KW  - Sociology
KW  - Sociology-mathematics
KW  - Sociology-statistics
ER  -