Quasi-experimentation :
Cook, Thomas D.
Quasi-experimentation : By Thomas D Cook and Donald T Campbell. - 1st ed. - Boston : Houghton mifflin Company , 1979. - xii,405p. ; PB 23.6 cm
0395307902
Validity
Inferring cause from passive observation
The conduct of randomized experiments
519.5 / COOT
Quasi-experimentation : By Thomas D Cook and Donald T Campbell. - 1st ed. - Boston : Houghton mifflin Company , 1979. - xii,405p. ; PB 23.6 cm
0395307902
Validity
Inferring cause from passive observation
The conduct of randomized experiments
519.5 / COOT