Cook, Thomas D. <br/><br/>
Quasi-experimentation : design & analysis issues for field settings 

 - Boston, Mass. :  ,  1979 
 - 405 
<br/><br/><label>Subjects--Topical Terms: </label><br/>SOCIAL SCIENCES<br/>RESEARCH DESIGN<br/>SOCIAL SCIENCES--RESEARCH<br/>SOCIAL SCIENCES--FIELD WORK
<br/><br/><label>LC Class. No.: </label>H62  / C664Q