TY  - BOOK
AU  - Cook,Thomas D
AU  - Campbell,Donald T
TI  - Quasi-experimentation : design & analysis issues for field settings 
SN  - 9780395307908
U1  - 300.72 22
PY  - 1979///
CY  - Boston 
PB  - Houghton Mifflin 
KW  - Social sciences
KW  - Research
KW  - Fieldwork
N1  - Includes indexes; Bibliography: p. 387-396
ER  -