Babbie, Earl <br/><br/>
The practice of social research 

 - 6th ed. 
 - Wadsworth 
<br/><br/><label>ISBN: </label>0534155766 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences-research
<br/><br/><label>Dewey Class. No.: </label>300.72 BAB