TY  - BOOK
AU  - Cook, Thomas D.
AU  - Campbell, Donald T.
TI  - Quasi-experimentation: design & analysis issues for field settings
SN  - 528620533
AV  - QA279 .C77 1979
PY  - 1979///
CY  - Chicago
PB  - Rand McNally College
N1  - Includes bibliographical references and index
ER  -