Belson, William A. <br/><br/>
Validity in survey research 

 - Hants  Gower Publishing  1986 
 - xvi,564p.  22cm.,with micro fitch 
<br/><br/><label>ISBN: </label>0566005107 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Surveys<br/>Social surveys
<br/><br/><label>Dewey Class. No.: </label>001.433  / B43V