Babbie, Earl. <br/><br/>
Survey research methods / 
Earl Babbie. 
 - 2nd  ed. 
 - Belmont, CA. :  Wadsworth,  1990. 
 - xx, 395  p. 
<br/><br/><label>ISBN: </label>0534126723 : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research.<br/>Social surveys.