Babbie, Earl. <br/><br/>
The practice of social research / 
Earl Babbie. 
 - 13th ed. 
 - United Sates :  Wadworth, Cengage Learning,  2013. 
 - xxiii, 583 p. ;  24 cm. 
<br/><br/>Includes index and bibliography : p. 563-575. 
<br/><br/>
<br/><br/><label>ISBN: </label>9781133049791  RM 634.58 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research.<br/>Social sciences--Methodology.