TY  - BOOK
AU  - Cook,Thomas D.
AU  - Campbell,Donald T.
TI  - Quasi-experimentation: design analysis issues for field settings
SN  - 0395307902
PY  - 1979///
CY  - Boston
PB  - Houghton Mifflin
KW  - Social sciences
KW  - Research
KW  - Field work
N1  - Bibliography: p.387-396
ER  -