Trochim,William M <br/><br/>
Research Methods:  The Essential Knowledge Base 
William M Trochim;James P Donnelly;Kanika Arora. 
 - 2nd Edition 
 - Delhi:  Cengage Learning/  2018. 
 - xxii;422p.: 
<br/><br/><label>ISBN: </label>9788131530856 
<br/><br/><label>Dewey Class. No.: </label>001.4 TRO.R