DeVellis, Robert F. <br/><br/>
Scale development :   theory and applications / 
Robert F. DeVellis 
 - Fourth Edition 
 - Los Angeles :  Sage Publications,  2017. 
 - 262 pages :  illustrations ;  23 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>9781506341569 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Scaling Social sciences