Babbie, Earl. <br/><br/>
The practice of social research / 
Earl Babbie. 
 - 5th.ed. 
 - Belmont :  Wadsworth,  1989. 
 - 501 p. 
<br/><br/><label>ISBN: </label>053409726x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Methodology.<br/>Social sciences--Research.
<br/><br/><label>LC Class. No.: </label>H 62