TY  - BOOK
AU  - Cook, Thomas D.
TI  - Quasi-Experimentation: Design & Analysis Issues for Field settings
SN  - 0-395-30790-2
U1  - 808.007 COO 22
PY  - 1979///
CY  - Boston
PB  - Houghton Mifflin Company
KW  - Literature
ER  -