Babbie, Earl R. <br/><br/>
The practice of social research / 
Earl Babbie. 
 - 4th ed. 
 - Belmont, California :  Wadwsorth Pub.,  1986. 
 - xxii, 577 p. 
<br/><br/><label>ISBN: </label>053405658X 
<br/><br/><label>LCCN: </label>91035038 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research.<br/>Social sciences--Methodology.