TY  - BOOK
AU  - Langbein, Laura Irwin
TI  - Ecological inference
T2  - Quantitative applications in the social sciences;10
SN  - 0803909411
U1  - 300.072 7 
PY  - 1978///
CY  - Newbury park
PB  - Sage
KW  - Ecological interference
ER  -