De Vaus David Ed. <br/><br/>
Social surveys.4V 

 - 2 
 - Los  Angeles Sage Publications       2007 
 - Sage benchmarks in social research methods. .
<br/><br/><label>Standard No.: </label>122588 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>Sigma : f.1'Pt4, P7.1-.4