QUASI EXPERIMENTATION DESIGN & ANALYSIS ISSUES FOR FIELD SETTINGS
COOK, THOMAS & CAMPBELL, DONALD
QUASI EXPERIMENTATION DESIGN & ANALYSIS ISSUES FOR FIELD SETTINGS - RAND-MCNALLY, CHICAGO 1979 - 385
QUASI EXPERIMENTATION DESIGN & ANALYSIS ISSUES FOR FIELD SETTINGS - RAND-MCNALLY, CHICAGO 1979 - 385