Vaus, David De. <br/><br/>
Surveys in social research. 

 - London :  Routledge,  2014. 
 - 381 p. :  ill. ;  30 cm. 
<br/><br/><label>ISBN: </label>9780415530187 
<br/><br/><label>National Library of Medicine Call No.: </label>W 20.5 VS 2014