Vaus, David de <br/><br/>
Research design in social research / 
David de Vaus 
 - London :  Sage Publications Ltd,  2001 
 - 279 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0761953469 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research--Methodology