TY  - BOOK
AU  - Cook,Thomas D.
AU  - Campbell,Donald Thomas
TI  - Quasi-experimentation : : design & analysis issues for field settin gs / 
SN  - 0528620533
U1  - 519.3 
PY  - 1979///
CY  - Chicago : 
PB  - Rand McNally College Pub. Co., 
KW  - Social sciences
KW  - Research
KW  - Field work
N1  -  Includes index;  Includes bibliographical references (p. 387-396)
ER  -