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

 - Chicago :  Rand McNally College,  1979. 
 - xii,405p. :  ill. ; 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>528620533 
<br/><br/><label>LC Class. No.: </label>QA279  / .C77 1979