TY  - BOOK
AU  - Cook,Thomas D.
AU  - Campbell,Donald T.
TI  - Quasi-Experimentation: design & analysis issues for field settings 
U1  - 001.434 22
PY  - 1979///
CY  - Boston
PB  - Houghton Mifflin Co.
KW  - Social sciences
KW  - Research
KW  - Fieldwork
N1  - Includes bibliographical references (p. 387-396) and index
ER  -