TY  - BOOK
AU  - Retherford,Robert D.
AU  - Choe,Minja Kim,1941-
TI  - Statistical models for causal analysis
SN  - 0471558028
PY  - 1993///
CY  - New York
PB  - John Wiley & Sons
KW  - Multivariate analysis
N1  - p. 251-253
ER  -