TY  - BOOK
AU  - Morgan, Stephen L.
AU  - Winship, Christopher 
TI  - Counterfactuals and casual inference: methods and principles for social research
SN  - 9780521856157
U1  - 300.72 MOR 
PY  - 2007///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Research
N1  - Includes references and index
ER  -